General's Factis Black Magic Erasers 18-Count Package.  An extremely soft, absorbent eraser designed specifically for erasing charcoal and pastels with ease. Cuts a clean edge and will not damage paper surface. Unlike traditional white erasers, it erases cleanly, leaving a new surface for smear-free erasing. 18 erasers per package. Vinyl erasers measure 1-5/8 x 7/8 x 7/16".