SKU 509 - 500 Pak Chrome Nitrogen Valve Stem Caps ABS Green N2 Insert Oversize 10 mm Complete with Silicone Inner Seal Includes Extra Inner Silicone Seal for a more secure fit. Durable ABS Plastic construction. When used on aluminum valve stems apply a thin layer of dialectic grease to inhibit corrosion on the valve stem which could damage the in tire TPMS system 10 mm in height - larger than standard caps fits all standard valve stems