CONVENIENCE: bicycle tire can be inflated using standard Schrader pump and car air compressor BE PREPARED: adapter can be left on the tire stem so it is always available to inflate your tires USE GAS STATION PUMP: conveniently inflate your bike tires and check air pressure at the gas station LIGHT, EASY TO INSTALL: screw on the Presta stem of your road fixie hybrid MTB 29er trail Fat bike QUALITY: aluminum alloy adapter with rubber o-ring seal. 4 adapters & 2 Schrader / car caps 4 Bike Valve Adapters and 4 Schrader / Car Valve Caps - Convert Presta to Schrader - French/UK to US - Inflate Tire Using Standard Pump or Air Compressor