This bumper is manufactured from the same quality PVC as our Dolphin boat fenders and offers the ultimate in cushioning of impacts from your boat. Molded in ribs on the interior of the UltraGard ensure it is very soft, but durable and will not collapse. The back has a slight radius allowing for easy mounting on pilings as well.35" x 2-1/4" x 5", Each . Back has a slight Radius also allowing for easy mounting on pilings | Ultragard 35" PVC Dock Cushion in White