Made of 100% polycarbonate materials with unique texture that helps prevent abrasive scratches.Number of wheels:8Protective corner guards ensure maximum protection against rigors of travel.Patent-pending T-Cruiser handle system allows you to maneuver your bag with ease.Patented Dual Cyclone Spherical spinner wheel system provides wide wheel bases for better traction and stability.Built-in TSA compliant lock secures your belongings with a main compartment featuring a 70/30 split opening for maximum packing.