Boat Trailer Bunk Slide Pads and Boat Trailer Glide Bunk Enders for Launching & Loading Boat on/Off Trailer Easier 3 X 10 Boat Trailer Bunk Slide Pads and Boat Trailer Glide Bunk Enders for Launching & Loading Boat on/Off Trailer Easier 3" X 10" [Product Model]: Tugboat Skateboard [Product Material]: Plastic ABS Product weight: 1520g Product size: 30 * 12 * 10 Product Application: Suitable for unpainted boats, such as bottom pontoon boats/flat bottomed boats/water motorboats/sea motorboats/water motorboats/fishing boats, double decker trailers. It is not recommended for painted boat bottoms as it may scratch the bottom paint. [Product Composition]: A10142-01: Black pad (3 inches * 10 inches) * 8PCS, bed tail pad * 2PCS, installation screws * 22PCS; A10142-02: White pads (3 inches * 10 inches) * 8PCS, bed end pads * 2PCS, installation screws * 22PCS Product Function : Reduce Friction: By using a skateboard made of low friction materials, the friction between the ship and the trailer during loading and unloading can be significantly reduced, making the operation easier and more effortless. [Product Features]: After installation, the skateboard can provide additional protection for the hull, avoiding direct contact with metal or other surfaces that may cause damage to the bottom of the ship.