Friendship Superior "729" （japan made sponge）reversal rubber is a renovation product by Tianjin Rubber Research Institute. In addition to the properties of original product like good adhesion, strong spinning and easy manipulation, Friendship Superior "729" has adopted special technology and import materials so that the innate properties as well as the outlook are further improved closing to perfect. Besides, Japan made sponge has contributed to fully manipulation of the sportsmen's skills. (Note: please use wet sponge or cloth to wipe the dirt on the rubber surface.)