The RV PRO single 6V (11 "W X 7.87 "D X 9.75 "H) case for 6 and 12 volt batteries is made of injection molded polypropylene plastic. This case has a clip-on lid that attaches securely to the base. It features heavy-duty handles that resist cracking and a vent plug to limit water infiltration. Installation hardware and instructions are included.