Carbon Wheel Tyre Air Valve Cap:

WellRayTech's Tire air valve cap is made by aluminum  with carbon fiber which can beautify your wheel to be unique. 

AR-VC012/VC011/VC010: Real carbon silver. ( Diamter: 11mm／Length: 20mm )

AR-VC006/VC005/VC004: Real carbon black. ( Diamter: 11mm／Length: 22mm )