Post bumpers are great protection for pipe supported type docks. Protects the boat from contact with the metal dock pipe and hardware at dock level. Easily slides over 1 1/2" dock pipe and rests securely against the dock. Molded from marine grade vinyl with an inflation valve to adjust firmness. Bumper measures 7" x 17" long. Slides over 1 1/2" dock pipe. Marine Grade Vinyl Inflation valve to adjust firmness. | Dock Post Bumper 7" x 17", Navy