Driven racing 90 degree valve stems are machined out of 60 series alloy and using the best materials and Schrader valve cores available.The 90 degree valve angle offers superior access to the valve stems for bike with large diameter rotors, allowing quick and easy access when adjusting or measuring tire pressure.The valve stems are sold as each and 2 are required for two wheels. Valve stems come in 2 sizes 8.5mm and 11.5mm to fit most bikes. F. Comes in black anodized finish with Driven logo etching.