Never mind the punctures, here's the new Granite Punk CO2 head! It works with 25g O2 cartridges and weighs just 25g, so it won't weigh you down. When anarchy strikes and your tires go flat, just grab a Punk and you'll be kicking the trails again in no time. The Punk CO2 Inflator is a small but powerful storage tool that will ensure you never get stranded on the trail. Works perfectly with MTB carrier straps and allows for easy tire inflation.