Set: 4x Gold Aluminum Alloy Presta Valve Caps + 4x Yellow Copper Presta to Schrader Bicycle Bike Valve Adaptors | Anodized Presta Valve Caps, Fits Mountain Bikes, Road Bikes, and Fixie bikes with Presta Valve Tubes | Copper Presta valve to a Schrader valve ：suitable for varied types of bikes, including mountain bike, roadbike, folding bike, especially for mountain bikes | Convert a Presta valve to a Schrader valve，Also turn a UK valve into a US valve Used with a Bicycle Pump or a Air Compressor | Direct replacement,easy to install, only use the wrench to put the caps onto the tire valve stem, Size: Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter).