Foxnovo 10pcs Presta to Schrader Bike Bicycle Pump Valve Adapters Connectors Foxnovo is a trade mark which has been registered in many countries and regions in the world, including U.S, Japan, European Union, etc. (Registration, No.85966052 in U.S Registration, NO.011974003 in EU ) Please look for " Foxnovo Authorized " when making purchases to get Origianl Foxnovo products Material: durable copper-plated zinc alloy and soft rubber. Size: Total length: about 1.5cm; Big head diameter: abou 0.9cm; Small head diameter: about 0.7cm. Can be used with a bike bicycle pump or an air compressor. Convert a Presta valve to a Schrader valve. Also turn a UK valve into a US valve.