IZOD Metro 2.0 5-Piece Set, Black, One Size Cases feature in-line skate ball bearing wheels that roll smoothly and quietly. Upright cases expand with the pull of a zipper for extra packing capacity. Ergonomically designed locking handle system is made using high quality steel. Travel tested hardware and self-repairing nylon coil zippers are designed for smooth and reliable operation. Lightweight design means you can pack more without exceeding airline weight restrictions.