The tips allow quick and easy correction of small areas of work without disturbing other parts of the pencil or charcoal drawings .White replacement eraser 50 pieces of 5x25mm, Refill (Supplement ) for Brustro Slim Battery operated eraser . FUNCTIONS OF WHITE ERASER - Used to erase out writing by graphite pencils without smudging. Erases precisely. Can also be used to erase from films. Selective highlights can be created in already existing drawings, e.g. signature can be added. Brustro is a registered trademark of Creative Hands Art Materials Pvt.