Courtserve Teaching Carts are precision-molded with nothing to rust. Great for every climate, from cold to the most humid. Heavy-duty precision-molded plastic cart frame and basket with large 12" rear transport wheels for going up stairs or across non-paved areas. The hinged weatherproof lockable lid makes this cart one of a kind. It is also designed to hold an umbrella and includes a bottom tray. Holds 500 tennis balls or 400 pickleballs.