Samsonite ExB 21" Carry On Rolling Luggage Inline skate wheels - Are constructed of polyurethane with ball bearings to minimize frictional resistance, offer durability and reduced resistance for smooth rolling. Push button handle - Locks when fully extended so you can push or pull your case. The handle also locks when fully recessed, greatly reducing the risk of damage when not in use. Top carry handle - Allows you to lift the case with ease and comfort, or carry it by hand when rolling isn't an option. Bottom grip handle - Is a moulded plastic grip on the bottom of a case, it is used to help in the lifting of the case in and out of vehicles.