Modulation is everything. That is the idea behind the Core CO2 inflator. Designed with an integrated dial regulator, you can crack open a cartridge just enough to make the tire take shape and make sure everything is seating properly. Once everything is good, open the valve and let er' rip. With alloy construction, this inflator can handle whatever beating you throw at it. Note: CO2 cartridges sold separately. Specifications: CO2 Type: Threaded Cartridge: Not Included Valve Compatibility: Presta Gauge: - Color: Black Weight: 19g