Easily store and transport balls in these extra-tough, rust-proof ABS-plastic carts. Safety hinge prevents top from closing unintentionally. Indoor Carts have four 3" dia ball-bearing swivel casters with pedal-lock; All-Terrain Carts have two 10" dia wheels and two 6" dia ball-bearing swivel casters with pedal-lock. Full-Size holds 24 official basketballs; Max-Size holds 40 official basketballs. Assembly required.