Planet Bike's line of CO2 replacement cartridges makes tire repairs quick and easy. - Planet Bike's CO2 cartridges work in Planet Bike inflators as well as most competitors' inflators. - Planet Bike cartridges are tested to the highest standards for durability, safety, and reliability. They contain pure CO2 with no oils or contaminants. - 100% recyclable steel cartridges - All threaded cartridges are compatible with Air Kiss, Red Zeppelin, Red Zeppelin 2 & Air Smith CO2