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 except for the pink and aqua blue barrels, which have light green erasers, and the orange and light green barrels, which have purple 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.