Classic Polycarbonate 28 4 Wheel Spinner Travel Case Blue. Rediscover a timeless design with the new Zero Halliburton Classic Polycarbonate 28 4 Wheel Spinner Travel Case. Polycarbonate hardside construction, custom designed draw-bolt latches as well as a three digit TSA approved combination lock, this case will protect your valuables around the globe. Four wheel spinner design built with sealed ball bearings as well as a multi stage retractable handle