Armstrong Twister recommended shoes This way the ball can

This way the ball can be returned very short over the net

The upper rubber is slightly sticky and medium hard

active or passive

The 729-5 combines a medium hard underlay with a very elastic and slightly sticky rubber surface

somewhat faster than the normal 729-08

Armstrong Twister recommended shoes This way the ball can"Developed by the Chinese team and kept secret for 10 years. Designed to create unpredictable topspins. Bottom layer is much thinner to give maximum flexability and surface of pimples are very rough to increase spin power. Very hard for opponent to play against. Speed: 58 Spin: 72 Control: 72 Hardness: Soft