These mechanical pencils are refillable and come in either a .5 mm or .7 mm lead size. 12/box. The assorted includes 3 each smoke, blue, red, green. They all have a side lead advance mechanism, a comfortable rubber grip, and white (refillable) erasers. The manufacturer, Sanford, does not test any of its products on animals. Eco Categories: Reuse, long life, animal friendly. Note: Sale prices limited to quantities on hand.