These Slime Presta to Schrader Bicycle Tire Valve Adapters (Standard) are useful for bicycle repairs. They come in a pack of two, one for each tire. Use these Slime valve adapters to change a Presta valve to a Schrader one. This allows for a standard inflator, gauge or a pump to be used. Keep them handy to make refilling tires of a bike easier and faster. Made of metal with a brass finish, they're designed to last a long time. These adapters are easy to install. Instructions are printed on the back of the package for extra convenience.