The Roadie TT Twin Turbo is a full metal, pocket sized mini pump that transfers larger air volume from a bigger diameter outer chamber into a smaller diameter inner chamber to deliver more air at higher pressures to fill tires 50% faster and easier. Integrated dust cap keeps pump head clean and thumb lock lever ensures an air-tight seal.HEAD: Presta with integrated dust capBARREL / THUMB LOCK /HANDLE: Aluminum CAPACITY: 160 psi / 11 barVOLUME PER STROKE: 41.4 ccADDED FEATURES: Side mount bracketSIZE: 19.5 x 3.3 x 2.35 cm / 7.7" x 1.3" x 0.9" WEIGHT: 100 g / 3.53 ozProp 65 WARNING: California purchasers click here for Prop. 65 warning