POLYURETHANE PROTECTIVE PADS. Set of 4 to protect 2 mounting arms. METAL ARMS NOT INCLUDED. Protect your RV Bumper from Tank Carrier Mounts. Prevent metal to metal contact. Compatible with Camco Rhino, JMTAAT and other similar Tank Mounts (see pictures.) No adhesives or permanent attachments. One time installation. Set of 4 polyurethane pads (METAL ARMS NOT INCLUDED) that will preserve your RV bumper by preventing metal-to-metal contact when you attach bumper mounts for a Tote Tank Carrier. Compatible with Camco Rhino, Ecotric and Kuafu brands, and bumper sizes 4" x 4" or 4.5" x 4.5".