The Genuine Innovations Ultraflate is a best seller for a reason: this CO2 bike tire inflator works with any type of CO2 cartridge, is thoughtful enough to protect your hands from the cold of the cartridge, and is so quick and easy to use, you'll be riding again in no time. Trigger controlled technology built in trigger lock prevents accidental discharge. Easy to use just drop the CO2 cartridge into the cup, screw on the head, attach to the valve, unlock safety latch, and pull the trigger to release air. Compatible with both Presta and Schrader valves. Includes one 16 g non threaded CO2 cartridge compatible with all Genuine Innovations threaded and non threaded cartridges except 45 g. Heavy duty design and construction made of glass reinforced nylon with brass internals. Weighs 2.2 oz.