Air fill kit includes two 16g CO2 cartridges and nano air booster in one. Can be mounted on the top of the "Duo Fixer" only. Topek screws included 2 0.6 oz (16 g) CO2 cartridges. Includes duofixer (L x W x H): 4.3 x 1.4 inches (110 x 47 x 36 mm). Weight: 5.9 oz (149 g). Nano Air Booster, Cutting aluminum alloy head compatible with Presta and Schrader screw. Weight: 0.6 oz (16 g). The CO2 cartridge included is disposable. Cannot be stored after use.