Crank Brothers Sterling CO2 Inflator Kit co2 inflator with 2 cartridge set threaded 16g co2 cartridge and push-spring controlled inflator head with integrated frost guard compatible with threaded 12g, 16g, and 20g cartridges Threaded 12g, 16g and 20g 63 grams; 45 grams (cartridges only) Weight: 16 grams