This Harpoon Master Blaster DX compact mini-pump features a high or low pressure selector to use on road or mountain tires. SmartHead technology automatically adjusts to fit Presta and Schrader valves. Telescoping tube with locking mechanism for high- or low-pressure pumping. Padded, ergonomic pistol-grip handle for comfort while pumping. Pistol grip handle has integrated compartment for included ball and air bladder needles. BigTube aluminum barrel on the Harpoon Master Blaster DX can pump more air per stroke than most other mini pumps.