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