Taylor Mades Straight Dock Wheel rols smoothly for ample cushioning, plus molded-in valve makes it easy to adjust the firmness. Heavy-duty hot-dipped galvanized hardware secures to your dock. 12 and 18 wheels use 2-dia. axle housings to maximize strength. Manufacturers three-year warranty. Per each. Sizes: 9, 12, 18. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Dock Hardware.