The only 2-Cylinder, common piston Straightline with vertically-engaged, twin-drive gears. Lack of "rolling gears" common to all other straightlines eliminates "humping and jumping" at the end of each reciprocal stroke. Two in-line Cylinders, micro-honed to eliminate cylinder wall drag, power an oversized high-alloy piston. Double rack and pinion gear assemblies give twice normal gear contact for maximum balance and thrust. These precision assembled components make the HUSTLER a superb all-purpose straightline with synchronized strokes so smooth and powerful it gets lighter with use.; SPM: 3000; Wt: 6lbs. 4oz.; Air Consumption: 6.2 cfm @ 90 PSI; Noise Level: 90 dBa; Pad Size: 2 3/4" x 16"