STI Genuine Valve Cap Set of 4These wheel valve caps are light weight with a design that features a knurled finish on machined aluminium to prevent slippage. Remove the standard valve caps to install these. A silver alumite treatment has been applied to the surfaces of these valve caps to improve resistance to weather and match the colour of aluminium wheels. The hexagonal heads of the valve caps have rounded tops, and a cherry red STI logo is stamped on the embossed area.