Tri-BackUp series is a complete system that Topeak has carefully integrated storage, hydration and repair into one solution for triathletes. The Tri-BackUp Air Station is an adapter for mounting a CO2 inflator, CO2 cartridges, and a mini pump. - Material: Engineering grade plastic - Compatibility: HybridRocket RX, RaceRocket HP Carbon, RaceRocket HP, Micro AirBooster, - Two 16g CO2 cartridge - Mount: Works w/ TRI-BackUP Elite / Pro V / Pro I - Size: 10.3 x 8.6 x 3.3 cm / 4.1" x 3.4" x 1.3" - Weight: 30 grams / 1.06 oz *Mini pump, CO2 inflator, CO2 cartridges & Tri-Cage not included