Topeak Micro Booster CO2 Inflator Head with 16-Gram CO2 Cartridge (Steel, 1.8 x 0.9 x 0.9-Inch) Head fits Presda and Schrader valve types Micro AirBooster features CNC aluminum construction Accepts standard threaded CO2 cartridges. 15.5-Gram/0.55-Ounce 1 Threaded 16 g CO2 Cartridge