This lightweight, portable, compact batteryoperated electric eraser has an impressive 12,000 rpm strong torque motor that is built to last. Use for drafting, architectural plans, arts and crafts, etc. Comfortable hand contour with sleek design, it weights only 2.6 oz. and fits in your back pocket. Remove marks and lines instantly with a gentle touch. The kit comes with two alkaline AAA batteries, ten blue erasers for drafting ink, ten white erasers for pencil lead, and two eraser chucks. Sakura offers consumers a 90-day limited warranty.