Feature: 1. The size of a single leveling block is 8.5 x 8.5 x 1.3 in. Stacked to the required height for customizable leveling, each block adds a full inch to the stack height. 2. Sturdy and durable anti‑skid pad, helps prevent the leveler from sliding when backing the camper tire onto the leveler. 3. Made of high‑quality ABS material, high hardness and long durability. The strong bottom structure prevents them from sinking on soft ground. 4. Easy to use, just set them into a pyramid shape to reached the height required for the RV to rise and drive into the stack. 5. Can be used with single wheel, double wheel, tandem wheel, jack, 5th wheel jack, hydraulic jack and stabilizer jack. Specification: Item Type: Leveling Blocks Kit Material: ABS Color: OrangeSize: Approx. 21.59 x 21.59 x 3.3cm/8.5 x 8.5 x 1.3in Quantity: 1 Set (5 blocks + 1 strap)Features: Helps prevent the leveler from slipping when backing the campers tire onto the leveler. The strong bottom structure prevents them from sinking on soft ground.. Package List: 5 x Leveling Blocks1 x Strap