The Staedtler/Mars corded erasing machine has extra power for cleaning those larger areas. The heavy duty, extra powerful, 15 watt AC motor runs on direct 115-volt power. The unbreakable Lexan plastic housing fits the hand comfortably and can be used for either right or left-handed operation. It has an all-metal collet and hanging hook. This eraser uses an eraser rod that is 5-1/8" long with a 0.275" dia. The eraser rod is made of the same white vinyl material as the blocks.