Topeak Ninja Master+ CO2 FuelPack TNJA-MABThe Topeak Ninja Master+ CO2 FuelPack mounts under Ninja water bottle cage with interchangeable Cage Mount or use alone with Frame Mount. The CO2 FuelPack is made from CNC aluminum, fixes flats, and inflates in a flash. Compatible with Presta and Schrader Valves. Comes with 2 threaded 16g CO2 cartridges with a compartment for CO2 inflator and cartridge. Weighs only 129g.883466034181