The Dockmate Post Bumper is designed for a tight fit against the post for better protection to dock and boat. This bumper has a curved back that mounts flush to your curved piling or post. Recessed mounting points are angled, so they're easier to reach for mounting. This air-filled bumper is made of a tough PVC that's flexible for more protection. Designed to fit 6" to 12" piling. Mounting hardware included. 48"L x 6"W x 4"D.