Not just for rubbing out! The Battery Eraser is ideal for creating unusual effects & for experimenting with different drawing techniques. It can of course be used to rub out unwanted marks too! When the eraser is switched on, the spinning action of the eraser lifts pigment from the paper. The precise control offered by the eraser makes it suitable for highlighting & refining marks & amending small areas of work. The operating button is positioned on the top of the eraser which means it is ideal for left & right handed people & is very comfortable to use. The battery eraser comes on a blister card complete with 8 spare erasers (batteries not included).