Supply Of 13 Mm Packing Ring For Wheel Tread Wear 13 Mm Packing Ring For Wheel Tread Wear To Rdso Sk. No. 97072 Alt-nil. Rdso Specification C- 9703. Material-ultra High Molecular Weight Polyethylene, Uhmwpe Or Nftc. This Item Is Restricted For Procurement From Icf Approved Sources Only..