4Pcs Black Premium Quality Portable Tire Saver Ramps For Flat Spot and Flat Tire. Features： Tire saving blocks help prevent flat spots or damage to car, caravan or motorhome tyres whilst they are stationary for prolonged periods of time, such as over winter. Maximum weight capacity 5tonne per pair. Saves installing winter storage wheels. Increased stability, as wheels cannot easily be moved in either direction without deliberate intent to do so. Specification： Dimensions：Approx. L 440 x W 200 H 40mm Type: Ramps & Chocks Suitable for tyres with diameters from 10” to 20” Tire Saver prevents flat spots and is suitable tyre diameters 10"(25.4cm) - 20"(50.8cm) Nett Weight:1.14kg Capacity Pair: 5tonne Pacakage Include： 4 x tire savers