rubber soccer ball, rubber cover, smooth surface, rubber bladder, official size and weight (1) Material: rubber of good quality.(2) Official Size & Weight: 5#, 4#, 3 ... #, 2#, 1#.(3) Bladder: made of good quality rubber/butyl, and wound with strong fabric to enhance and protect ... , and also good quality. All because we are professional factory. Rubber Soccer ball, rubber football