Our piling cap is made from heavy-duty Polyethylene and lasts 10+ years--which means it withstands weathering up to 10 times longer than PVC caps. The cone shape looks great, keeps birds and their mess off of your dock, and makes dock lines easier to toss onto the piling. We have every size for your dock, pier or floating dock. Protect your pilings from internal rot and splintering. Could not be easier to install, just slide it right on, and nail or screw in place!