KAZE SPORTS 4 Ball Double Deck Bowling Roller 5 inch smooth PU polyurethane wheels with bearings for an ultra-smooth quiet ride Retractable square locking handle retracts flush to base and extends to 40 inch 2 side pockets, 2 large front pockets, 1 top shoe compartment hold up to 15 men size shoes Detachable top bag becomes a full-featured two ball tote with adjustable non-slip shoulder strap Bottom ball storage compartments feature easy open front load design