40+New Ball Optimization – Designed specifically to enhance the speed of 40+new material table tennis, suitable for fast arc play with stronger continuity. Extremely easy to penetrate – can penetrate with small force, “transparency” is its biggest selling point, and the threshold for exerting force is extremely low. 65 # Large Pore Sponge – “Large Pore Foaming”+”High Elastic Particle Penetration” Technology, with outstanding elasticity and strong support.