Two 16-gram unthreaded CO2 cartridges for use with Genuine Innovations CO2 inflators. See our #210174098 for Ultraflate Pro. For use with Ultraflate Plus, Ultraflate Pro, and Slim Jim CO2. Inflates narrow-profile tires to high pressure, midsize tires to optimal pressure, and wide MTB tires to rideable pressure.. Works well for most road bikes.. Due to federal shipping restrictions regarding products with hazardous or flammable materials, this product can only be shipped via ground transportation. Were sorry, but Next Day Air, 2nd Day Air, USPS Priority or Express shipping are not available for this item. Additionally, this product cannot be shipped to Canada, Hawaii, Alaska, Catalina Island, Puerto Rico, APO, FPO or international addresses. Thanks for your understanding.