Pentel Twist-Erase Automatic Mechanical Pencils - Assorted Sizes and Barrels: QE515A, QE517B, QE519C, 1 for each Writes 0.5mm (black barrel), 0.7mm (burgundy barrel) and 0.9mm (blue barrel) lines Rubber grip for nonstop writing comfort Twist barrel to advance and retract eraser Jumbo eraser is larger than ordinary pencil erasers Refillable with Pentel's Super Hi-Polymer lead and E10 jumbo refill erasers