Sport Seats. - CONSTRUCTED AROUND A STRONG STEEL SEAT FRAME. - 2 HOLES FOR RACING BELT HARNESSES. Sport Seats.- CONSTRUCTED AROUND A STRONG STEEL SEAT FRAME. - 2 HOLES FOR RACING BELT HARNESSES.package size (cm)138*32*58N.W/PC (kg)17G.W/Ctn(kg)20PCS in one Carton1PCS IN 20FCL116PCS IN 40HQ260MaterialPUadjuster,slidewaysingle,singledia.(mm)20ply(mm)1.4-1.5back spongecoldothershot