Zero Halliburton Geo Aluminum 2.0 Carry-On 4-Wheel Spinner Luggage - Black Utilizes premium Anodized Aluminum that is as strong as steel but only one-fourth the weight. Innovative and unique Double-Rib Design provides additional strength and durability as well as optimum protection of its contents. Designed to securely close using two TSA-Accepted Combination Locks that are integrated into the Draw-bolt Latches. Seals airtight with the addition of a Neoprene Gasket Seal around the opening's perimeter. The Spinner Wheels provide convenient and controlled 'by-your-side' mobility for easy traveling.