This type of rubber was developed by the Chinese team and kept in secret for 10 years. The bottom part of a pimple is thinner than the top part. The surface of the pimples is very rough to increase spin.This rubber is designed to create unpredictable spin. Produced in Japan by Armstrong Company the inventor of sponge and sandwich rubber. TWISTER EXT has pimples with the bigge diameter than Twister, so it can hit the ball sharply and is good for the counter offense. Made in Japan.
