Tire Savers cradle your tires to prevent flat spots from forming during long term storage. Manufactured specifically for tires 27" to 40" tall, they are ideal for larger vehicles as well as motorhomes, RVs, trailers and campers. Made of solid PVC, Tire Savers won't crush, crack or slip. The unique ribbed design on both the top and the bottom, prevent the Tire Savers from sliding on the floor and provides traction for the tire.