Lezyne 25g Twin Speed DriveCNC MACHINED, SLIP FIT FOR SCHRADER PRESTA, 90 DEGREE HEAD, INCLUDES 1X 25G CARTRIDGE WITH NEOPRENE SLEEVE A durable CO2 dispenser built from CNC machined aluminum, the Twin Speed Drive CO2 features slip on valve operation for easy inflation. A Twin slip fit head presses onto Presta or Schrader valves and a neoprene sleeve insulates your hand from the cold during discharge. Available with a 16g cartridge, a 25g cartridge, or as only the inflator head.