The 1510M is a mobility version case with 4" diameter x 1.5" wide (10.2 x 3.8cm) heavy duty polyurethane wheels and stainless steel bearings. It has retractable extension handle, easy open double throw latches, open cell core with solid wall design - strong, light weight, O-ring seal, automatic pressure equalization valve, comfortable rubber over-molded top and side handles, stainless steel hardware and padlock protectors.