Traveler's Choice Cambridge 24" Hardsided Spinner (Silver Grey) Made from polycarbonate ABS materials Hardshell suitcases protect your belongings ABS gives the shell greater rigidity so that it will not permanently deform when under pressure but instead 'pop' back up into its original shape ABS material for a lightweight, durable and scratch-resist Convenient removable add-a-bag straps for carrying additional bags