Tubes. All inner tubes must be standard production first line, heavy duty butyl tubes or natural rubber of fresh stock. All tubes must be of quality not less than the tubes normally furnished in representative quantities by OEM as original equipment for automobiles, trucks, tractors, buses, backhoes, loaders, motor graders, and other heavy equipment. Tubes must conform to all applicable federal specifications. All tubes must be NEW and must have been produced or manufactured within the last one (1) year prior to installation or delivery to the Purchasing Entity.