Features feather lightweight yet extremely durable top grade polycarbonate ABS hard shell materials for maximum impact resistance. The Polycarbonate allows the shell to absorb impact by 'flexing' when under heavy pressure. The ABS is then added to give the shell greater rigidity so that it will not permanently deform when under pressure but instead 'pop' back up into its original shape. Features an internal retractable aluminum dual-tube telescopic handle with push button system. The 28" and 24"hard shell spinner suitcases feature state of the art 360 degree spinner wheels, allowing effortless maneuverability even when the checked cases are loaded up. The 21" hard shell rolling carry on features 2 recessed in-line skate wheels with aluminum ball bearings for smooth and quiet rolling. Features a spacious main compartment with full interior lining, top and side carry handles for easy lifting and an interior zippered garment compartment.