The RV PRO large case (13.38 "W X 7.75 "D X 10 "H) for 6 and 12 volt batteries of group 24-31 is made of black injection molded polypropylene plastic. This case has a clip-on lid with NOCO straps 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 inclu...