Easy to use, easy to control and affordable. Genuine Innovations' Microplate Nano CO2 bicycle tire inflator gives you the best bang for your buck when it comes to quality and ease of use. This product includes one bicycle CO2 inflator head and one 20 gram threaded CO2 cartridge. The bicycle CO2 inflator head's Twist-to-Inflate technology puts you in control of your air flow and makes it easy to air up your bicycle tires. Simply thread on your favorite CO2 cartridge (compatible with 16 gram and 20 gram threaded CO2 cartridges), twist the cartridge off slightly to engage inflation and tighten it back on to shut it off. Sure beats exhausting your arms on the side of the road or trail with a travel bike hand pump! This compact and nearly indestructible bicycle CO2 inflator head is compatible with both Schrader and Presto valves. It also comes with a Lifetime ! So whether you are new to cycling, or already a cycling enthusiast, you can put your trust in Genuine Innovations' Microplate Nano CO2 inflator head. Petite power!