4Pcs Black Portable Tire Saver Ramps Highly Visible for Flat Spot and Flat Tire. Features： Tyre 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” Tyre 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 tyre savers