Oversized sealed-ball bearing construction, random orbit action for fast and super smooth sanding, pad control system for controlled pad speed upon start up, through the pad dust collection system, dust sealed switch, rubberized grip, uses quick-change 5" (8-hole) hook-and-loop abrasive paper. Specs: 120V no load OPM 12,000, orbit diameter 1/8", 4-13/16" pad size, abrasive disc size 5", 6"Lx4-7/8"Wx6"H, weight 2.9 lbs. Includes: (1) abrasive disc, dust bag, plastic case.