Pentel Side FX Mechanical Pencil, 0.5mm, Black Barrel, Box of 12 (PD255A) Side advance automatic pencil with "dial-up" eraser 0.5mm lead produces crisp, fine lines Large barrel with no-slip, latex-free grip and extra-long eraser Refillable with Hi-Polymer Lead and E10 jumbo refill eraser Box includes 12 Pencils