You want AgustΓn Tapia's AT10 Genius, that much is settled. The thing is, there are two versions side by side, they cost roughly the same, they have the same shape and the same frame, and nowhere does it clearly say what that carbon number actually does to your game. This is the question we get most often by email and DM, so here is the answer properly in one go, including a rating per category.
We sell both models and play both of them ourselves on court, so you won't find copied brand copy here. You'll read where you notice the difference and, just as important, where you don't.
Table of contents
- The difference in two sentences
- What 12K and 18K really mean (and why it works differently at NOX)
- The specifications side by side
- Our rating per category
- Finishing at the net: smash and volley
- Bandeja and vΓbora
- Defending and building the point
- Your arm after two hours of play
- Honest answer: when the difference doesn't matter
- Frequently asked questions
The difference in two sentences
The NOX AT10 Genius 12K Alum Xtrem 2026 is the harder face and gives you a dry, direct response, letting you feel exactly where the ball hits the face and where it's going. The NOX AT10 Genius 18K Alum 2026 plays softer, dampens more and forgives a shot you don't quite hit from the centre.
Everything else is the same. Same hybrid teardrop shape, same updated 2026 frame, same rough face with the extra layer of sand, same Weight Balance System to adjust the balance yourself. So you're not choosing a different racket here, you're choosing a different character within the same racket. Want to see the whole line first? Take a look at the NOX AT10 Genius collection or read our guide to the complete AT10 Genius series.
What 12K and 18K really mean (and why it works differently at NOX)
12K and 18K refer to the number of filaments in a carbon bundle, so to the weave the face is built from. The idea you hear everywhere is simple: more fibres means a denser weave and therefore a stiffer face. With many brands that rule of thumb is reasonably accurate.
At NOX, that logic doesn't hold. The number of fibres says nothing about the final stiffness there, because that is determined by the thickness of the carbon used and by how it has been processed. The result is that in the AT10 Genius the 12K Alum Xtrem is actually the harder, more direct face and the 18K Alum the softer one.
What that means for you: don't fixate on the number, because within this line 18K is not the heavier or the better version. Look at the character, and that is exactly what you'll find below. The same principle applies across our whole range, by the way, as you can see in our hard rackets for precision and power versus our soft rackets for comfort and control.
The specifications side by side
| NOX AT10 Genius 18K Alum 2026 | NOX AT10 Genius 12K Alum Xtrem 2026 | |
|---|---|---|
| Shape | Hybrid teardrop | Hybrid teardrop |
| Carbon | 18K Alum | 12K Alum Xtrem |
| Touch | Medium, softer | Hard, dry and direct |
| Sweet spot | Larger and more forgiving | Smaller and more precise |
| Dampening | More, kinder on the arm | Less, more direct |
| Balance | Medium, adjustable via Weight Balance | Medium, adjustable via Weight Balance |
| Face | Rough with extra sand layer | Rough with extra sand layer |
| Level | Advanced | Advanced to professional |
| Our price | β¬229,95 | β¬209,95 |
View the NOX AT10 Genius 18K Alum 2026
View the NOX AT10 Genius 12K Alum Xtrem 2026
Our rating per category
These are our scores based on our own court time. Note the last line: both rackets get the same overall score, because both are excellent. They're just good at different things.
| Category | 18K Alum 2026 | 12K Alum Xtrem 2026 |
|---|---|---|
| Power on the smash | β β β β β | β β β β β |
| Direct control and placement | β β β β β | β β β β β |
| Sweet spot and forgiveness | β β β β β | β β β ββ |
| Comfort and arm-friendliness | β β β β β | β β β ββ |
| Spin and grip on the ball | β β β β β | β β β β β |
| Defence from the back of the court | β β β β β | β β β β β |
| Total | β β β β β 4,5 | β β β β β 4,5 |
Finishing at the net: smash and volley
What the 18K does better: your volleys stay calmer. Because the face gives a little more, a rushed volley you hit slightly too low still stays inside the court. In fast exchanges at the net where you're not always perfectly positioned, that feels more reliable.
What the 12K Xtrem does better: the ball leaves your face faster. The harder face loses less energy on impact, so your smash comes through harder and flatter without you having to swing harder. What that means for you: if you're the one finishing the point and you hit cleanly, the 12K is the version that scores slightly better here. Looking for even more explosive punch? Take a look at our padel rackets with the most power.
Bandeja and vΓbora
What the 18K does better: your bandeja gets over with more margin. The extra comfort means a bandeja you hit a little late still stays deep enough, which helps when you're still getting into position after a lob.
What the 12K Xtrem does better: control over direction and depth is more direct. You feel exactly what you're doing, and with the rough face you get sharp sidespin on your vΓbora. What that means for you: if you use your bandeja and vΓbora deliberately as weapons and not just as emergency shots, choose the 12K.
Both models have the same rough face with the extra layer of sand, so the difference isn't in how much grip you get on the ball. The fact that both share the same shape also helps, because shape determines more than you think. Read more about that in our explanation of diamond, teardrop and round or go straight to the best teardrop padel rackets.
Defending and building the point
What the 18K does better: this is where the 18K excels. Balls out of the corner, glass balls that just drop away and chiquitas you have to play under pressure still come off well even when you don't hit them perfectly. You get more comfort and, for some players, precisely because of that, more control
What the 12K Xtrem does better: the ball comes off drier and lower, exactly where you want it. There's no dampening between you and the ball, so your placement is more precise. What that means for you: this only works in your favour if your technique is consistent, because a shot outside the sweet spot won't be rescued by the racket here. Looking for maximum control instead? Take a look at our control padel rackets.
Your arm after two hours of play
What the 18K does better: the 18K absorbs vibrations better. If you play two, three or four times a week, or you've ever had trouble with your elbow, this is the sensible choice. Not because the 12K is bad, but because with the 18K you can keep playing longer without your arm taking over.
12K Xtrem: The directness and the harder face mean you feel more in your arm on impact. Some players may find this troublesome... We don't recommend this racket if you have arm complaints. If comfort is decisive for you, also take a look at our soft rackets for comfort and control or at the lightweight padel rackets.
Honest answer: when the difference doesn't matter
- If you've been playing padel for less than a year, you'll barely feel the difference between these two. What you will feel is that both of these rackets are demanding. In that case, you're better off looking at our padel rackets for beginners.
- If you don't yet consistently hit from the centre of your face, the 18K will work better for you in practice, whatever your ambition.
- The carbon number is not the most important thing about a racket. Shape, balance and weight determine much more how a racket feels, and those are the same for both models here.
- If you're torn between these two because you think the more expensive model is better, that's the wrong track here anyway. The prices are close together and the more expensive one isn't necessarily the best.
In short, if you're an advanced player, there's no right or wrong choice here. You're choosing between comfort and directness, and either choice gets you a racket the world number one wins his points with. We test everything ourselves on court before we sell it, precisely so you hear about differences like these from us and not from a brand brochure.
Frequently asked questions
What is the difference between the NOX AT10 Genius 18K and the 12K Alum Xtrem 2026?
The carbon weave of the face. The 12K Alum Xtrem plays harder, more directly and more explosively on impact; the 18K Alum plays softer, dampens more and has a larger sweet spot. Shape, frame, face and balance system are the same on both.
Is 18K carbon stiffer than 12K carbon?
Not at NOX. The number of fibres on its own says nothing about stiffness, because the thickness of the carbon used determines that. In the AT10 Genius, the 12K Alum Xtrem is actually the harder face and the 18K Alum the softer one.
Which of the two does AgustΓn Tapia play himself?
Tapia plays with the NOX AT10 Genius 18K Alum 2026, with his rackets tuned to his preferences in weight and balance. The racket you buy from us is the same model; a pro just plays with a custom-built racket, and the weight and hardness often differ slightly from the model in the shop.
Which is better for my elbow?
The NOX AT10 Genius 18K Alum 2026. The softer face absorbs more vibration, which helps during long sessions and for players prone to tennis elbow.
Are these rackets suitable for beginners?
No. Both demand consistent technique, and the 12K Alum Xtrem is the more demanding of the two. If you've only been playing for a year, you'll get more out of a racket with more forgiveness.
Torn between the AT10 and another top NOX racket?
Then the EA10 Ventus is a very interesting racket to look at. Read our comparison of the AT10 12K and the EA10 Ventus 12K, or our big comparison of all the top models of 2026.
