从 “7 29”第一代胶粒产品到现代 “729”系列套胶,“729”人经过不懈的努力,用全新的理念解决了乒乓运动中的“提高球速,旋转不强:加强旋转,球速降低”这一矛盾。 在传统理论中,套胶的软硬往往是指海绵的软硬,而“72扩人经过多年努力,提出了套胶整体的软硬度,而不仅仅是单纯 From the “7 29” first generation of rubber products to the modern “729” series of rubber, “729” people through the tireless efforts to solve the new concept of ping-pong movement “to improve the ball speed, rotation is not strong: Ball speed lower ”this contradiction. In the traditional theory, the soft and hard rubber is often refers to the soft and hard rubber sponge, and "72 people after years of expansion efforts put forward the overall hardness of the rubber sleeve, not just simple