The ultra-compact CO2 inflation kit includes a Nano AirBooster CO2 inflator and two 16g CO2 cartridges. It attaches to the seatstays with the included Duo Fixer, which allows dual use with Topeak Duo Fixer accessories, including Topeak QuickClick saddlebags, Tubi tools, CO2 mouthpieces, lights and fenders. Simply snapping in and out is all it takes for a safe and secure ride. Tools: Nano AirBooster CO2 inflator and 2pcs CO2 cartridges 16g Head: CNC aluminium, galus and auto valve Mounting: Duo Fixer on seatstays Compatibility: Topeak QuickClick saddlebags, HybridMaster Mini, FreePack and FlashFender DF Dimensions: 11 x 4.7 x 3.6 cm Weight: 149 g