Taylor Made Products Dock Pro Inflatable Dock Boat Wheels, Straight or Corner Mount Smooth rolling wheels offer substantial dock cushioning Feature molded-in valves to adjust the level of firmness Heavy-duty hot-dipped galvanized hardware mounts securely to the dock 12" and 18" wheels use a large 2" diameter axle housing for maximum strength 3 year warranty, Made in the USA Brackets and wheels are not interchangeable