What is a basketball made of?

It all depends on who the ball is made for! An NBA basketball is made of composite leather（合成皮革）, a synthetic material designed to withstand slam dunks（扣篮） and allow all-stars like Kobe Bryant to keep a good grip as they go for the ally-oop! WNBA balls are also made of composites but are slightly smaller because female players tend to have smaller hands. High school and college stars use real leather balls sometimes. Rubber balls are for novice players（初学者） and are great for street games because of their durability（耐用）. Beneath the surface, deep within each basketball lies a grid work of nylon（尼龙）, rubber, and a material called butyl. These layers help the ball stand up to hours of double dribbles（运球）.