Racket pages quote 3K, 12K or 18K as if it were a quality ladder. The number is a filament count, and the makers’ own descriptions show it predicts little about how a racket feels. Nox calls its 3K carbon stiff, Babolat sells a 3K face as flexible, and Nox calls its 18K face comfortable. On Nox’s own listings, 3K can also mean fibreglass.
Prices and descriptions below come from the makers’ pages and UK retailer listings, read on Thursday 5 November 2026. We have not tested any of these rackets, so feel descriptions are the makers’ wording and are quoted as such.
What do 3K, 12K and 18K mean?
The K is thousands of filaments in one carbon tow: 3K is 3,000, 12K is 12,000 and 18K is 18,000. It describes the yarn that goes into the face.
A carbon fibre specification published by Wichita State University’s National Institute for Aviation Research says the grade gives the tow size, “where 1K denotes 1,000 filaments”, with 3K, 6K and 12K as its examples. A composites supplier’s datasheet (ACP Composites) lists the same sizes as 3 thousand, 6 thousand and 12 thousand filaments.
Padel makers rarely spell this out. Bullpadel’s Hack 04 Dale Candela LTD listing says “TriCarbon 18K: carbon fibre with 18,000 filaments”. We read that on Padel Market’s page, because bullpadel.com blocks automated access. Nox and Babolat do not define their figures on the pages we read.
A tow is woven into fabric, so the weave is a second variable. Nox says its 3K fabric is made by weaving carbon fibre threads into small squares, and describes the 12K Xtreme face on its 2027 Ventus Hybrid as an exclusive weave that increases surface stiffness. The “Alum” in many Nox names refers to aluminised carbon.
Fibreglass faces versus carbon faces
The number 3K appears on both materials. Nox’s spec sheets for the X-Hero and the Equation Hard Advanced 2027 say “3K Fiberglass”, while its Ventus Control 3K says “3K Carbon Fiber”. Check the material word before the number.
Both fibreglass rackets still have carbon frames, per Nox’s spec lines, so “carbon” in a listing may describe only the frame. Nox lists frame, core, face and surface as separate items. Its Equation Hard technology list also names “Fiber Glass Silver”, described as fibreglass with a metallic finish and a stiffness between that of carbon fibre and fibreglass.
In our sample the fibreglass-faced rackets cost £51.50 to £108.99. The cheapest carbon-faced racket was £144.99.
Does a higher K mean a stiffer face?
No. Makers describe 3K faces as both stiff and flexible, and Nox calls its 18K face comfortable, so the K number alone predicts little.
Babolat’s page for the Technical Viper 3.0 says its “3K Carbon” is woven carbon fibre for “maximum explosiveness and precision”. The Technical Viper Soft 3.0 page says its “Carbon Twill 3K construction” increases flexibility and responsiveness. Both are 3K, both are diamond-shaped, and Babolat gives them different jobs. (The Soft’s spec table lists its surface as “Soft Carbon”.)
Nox’s wording runs across the grades. Its Ventus Control 3K has 3K carbon that “delivers the stiffness required for greater precision”. Its Ventus Control 12K has a 12K carbon face that “provides stiffness and a dry, direct feel on impact”. Its AT10 Genius 18K Alum has aluminised 18K carbon “that provides a solid and comfortable feel and a more homogeneous performance under temperature changes”.
If a higher number made a stiffer face, those descriptions would line up in order. They do not, and Nox’s spec sheets list frame, core, face and surface as separate items, so the face grade is one input among several.
Seven rackets at UK prices
Prices are in-stock listings on 5 November 2026 at PDH Sports, Everything Padel, Racket World, PadelHQ and Padel Market. Where a range is shown, it spans the stockists that listed that exact model. Babolat’s prices on babolat.com/gb are the recommended retail price.
| Racket | Face, per maker | Maker’s wording | UK price |
|---|---|---|---|
| Nox X-Hero 2026 | 3K fibreglass | Faces “optimise ball rebound” | £51.50 to £65.99 |
| Nox Equation Hard Advanced 2027 | 3K fibreglass | Feel listed as medium-hard | £99.00 to £108.99 |
| Babolat Technical Viper Soft 3.0 | 3K carbon twill | ”Flexibility and responsiveness” | £144.99 (RRP £250) |
| Babolat Technical Viper 3.0 | 3K carbon | ”Explosiveness and precision” | £160.00 to £271.99 (RRP £320) |
| Nox Ventus Control 3K 2027 | 3K carbon | ”Stiffness” for “precision” | £265.50 to £274.50 |
| Nox Ventus Control 12K 2027 | 12K carbon | ”Stiffness and a dry, direct feel” | £225.00 to £259.99 |
| Nox AT10 Genius 18K Alum 2025 | 18K aluminised carbon | ”Solid and comfortable feel” | £149.99 to £159.99 |
Two lines stand out. At Everything Padel the Ventus Control 3K is £273.99 and the Ventus Control 12K is £233.99, so the lower K number costs £40 more. They are different models built around different players, but it shows the number does not set the price.
The 18K row is last season’s model. PDH Sports lists the 2027 AT10 Genius 18K Alum at £304.99 against £159.99 for the 2025 one. We have not compared the two spec sheets, so check them before treating the older racket as the same product.
Do you need a carbon face?
No. Nox lists its 3K fibreglass rackets as beginner-to-intermediate and intermediate models, and in our sample they cost £51.50 to £108.99.
Nox’s X-Hero page calls it the “ideal racket for beginner and intermediate players”, and the Equation Hard Advanced 2027 spec lists its level as intermediate. Carbon faces in our sample started at £144.99. Our view is that a first racket is better chosen on shape and weight than on face material, and our first racket guide and best value racket page cover that price band.
When you do compare listings, four checks cover most of it:
- Read the material after the number: fibreglass or carbon, and whether “carbon” describes the face or only the frame.
- Compare shape and weight first, using our guides to racket shape and racket weight.
- Look at the surface texture separately. Nox’s spec lines list it apart from the face material (the Equation Hard has a 3D Texture surface), and it is what our spin racket guide covers.
- Compare the price with the recommended retail price and with last season’s model, which a stockist may still hold.
For single-model detail on the rackets above, see our pages on the Nox Equation, the Babolat Technical Viper and the Nox AT10 Genius.