Footballs are typically made from cowhide or vulcanized rubber, making their nickname “pigskins” somewhat ironic. Football fans often perpetuate the idea that footballs used to be made of pigskin, which is how they got their nickname, but it turns out this isn’t the case.This football has the official size and weight. It can be used at training camps, school ground, etc. This product is made of premium synthetic leather and reinforced nylon wool. Nice lamination work and clean finish.Size 5 ball must be 68 to 70 cm in circumference. Averaging that to 69 cm and then dividing by π gives about 22 cm for a diameter. The ball’s weight must be in the range of 400 to 450 grams (14 to 16 oz) and inflated to a pressure of between 0.6 and 1.1 bars (8.5 and 15.6 psi) at sea leve.