The Topeak(R) Mountain DA mini pump features an oversized aluminum barrel that fills large volume MTB, fat bike tires with ease. The Dual-Action (DA) doubles volume with each stroke and inflates tires up to pressure fast. Integrated dust cap keeps pump head clean and thumb lock lever insures air-tight seal. DESIGN: Head: Presta / Schrader / Dunlop with integrated dust cap Capacity: 60 psi / 4 bar Materials: Aluminum barrel; plastic thumb lock and handle Volume per Stroke: 81 cc (pull + push) Size: 22.3 x 4.6 x 3.4 cm / 8.8" x 1.8" x 1.3" Weight: 126 g / 4.44 oz