These Valves are specifically designed to be used with the TPMS (Tyre Pressure Monitoring) modules that fasten to the bottom of the valve.They are Nickel coated and also have a unique black T-shape grommet to help reduce galvanic corrosion.The valves slotted and hexagonal base allows easy replacement using a screwdriver or wrench.These are genuine items, not inferior copies.It is recommended that VALVEgrease® is used to lubricate the Valve and Valve hole area to help prevent corrosion around the Valve hole which can lead to air loss. Please see separate product listing.More information on replacing Valves in your Alcoa® Wheels can be found in the Alcoa® Wheels Service Manual.For standard Tubeless valves not compatible with the TPMS modules please see separate product listing.If you are unsure on what Valve you require, please contact the office for help and advice.