The PRO-TEK's 9108DP series sanders operate in a straight line, feature dual pistons and 2=1/2" x 15-1/2" paper size, 2,200 strokes, 1" (2.5 cm) stroke length, 1/4" NPT air inlet, 90 PSI air pressure, 5 CFM air consumption, 2.8 kg weight (6.3 lbs), and feature a replacement pad of the 10829 series.