The Fatty Object is the first CO2 inflator on the market designed specifically to inflate fat and plus-sized tires. Made of indestructible alloy, the Fatty Object fits on both Presto and Schrader valves and its oversized control knob is easy to operate, even with gloves on. The Fatty Object comes with a 38g threaded CO2 cartridge a lightweight foam insulator sleeve that will fill a 26x4. 8 tire to 6-7psi or a 29x3. 0 tire to 20-22psi.