H40+New Material Table Tennis One Star Two Star Three Star Stable Endurance Training Ball

Comparison of star ball parameters
a tiny bit
Weight of ball: 2.35~2.63g
Spherical roundness error: 0.25mm
Hardness index: 1.1mm
Suitable for: students and beginners
Two stars
Weight of ball: 2.40~2.53g
Spherical roundness error: 0.25mm
Hardness index: 0.9mm
Suitable for: adult and amateur training competitions
Samsung
Weight of ball: 2.53~2.64g
Spherical roundness error: 0.8mm
Hardness index: 0.9mm
Suitable for: domestic and international training competitions