Neutral rendering of the topsheet type. Not a product photograph and not a reproduction of manufacturer packaging.
Yasaka
Cobalt α
Short pips · Standard ball · Spongeless (OX) hardness
ActiveJapan currentOX only
Also listed as: Cobalt Alpha, Cobalt Alfa
TTDNA ratings
Speed56
Spin30
Control86
Power53
Grip23
Tackiness0
Arc28
Catapult45
Throw angle33
Elastic50
Spin sensitivity22
Short game73
Blocking75
Backhand flip51
Counterloop51
Opening loop41
Chop69
Serve40
Service receive80
Difficulty42
Beginner friendly64
Durability78
Specifications
- Category
- Short pips
- Series
- Standalone
- Ball type
- Standard ball
- Hardness
- Spongeless (OX)
- Thickness
- OX
- Made in
- Japan
- Colours
- red · black
- Technologies
- One-sheet short pips
Availability
- Market
- Japan current
- Status
- Active
- Official scale
- Yasaka Japan · Mark V = 10 scale
- EU list price
- €34.90
- Data checked
- 31 July 2026
Variants and configurations
2 variantsColour, thickness and configuration are variants of one model — never separate products. Colour never changes a rating, MAX and OX stay qualitative labels, and OX carries no sponge hardness.
red · OX
Standard · No sponge (OX) · Topsheet only
Speed 10.0 · Spin 10.0 · Control 10.0
black · OX
Standard · No sponge (OX) · Topsheet only
Speed 10.0 · Spin 10.0 · Control 10.0
Known users
Jon PerssonElias RanefurChristina KällbergHana Matelová
No public report for this exact sheet. Shown: contracted Yasaka athletes — model use not confirmed.