PF4 was used by dozens of Chinese players to win the world champion in the age of 38mm. In 2016, new PF4 released is more suitable for 40+ T.T. balls, ideal for loop drive with fast attack. The new PF4 keeps the unique feature of PF4 while increases the speed. The new PF4 uses the rubber produced in new sulfurization technology, adopting dense hard sponge and a new cement is added between sponge and rubber.