Easy-access book-opening design Push-button locking Inline skate wheels are constructed of polyurethane with ball bearings to minimize frictional resistance, offer durability and reduced resistance for smooth rolling Top carry handle allows you to lift the case with ease and comfort, or carry it by hand when rolling isn't an option 23 3/4" x 24" x 10 3/4" closed. 48" x 23" x 41/2" opened.