Quick Dock Pencil is preloaded with 12 pieces of lead inside an all-in-one cassette tube and an extra-long twist-up eraser. Refill lead and eraser cartridge by simply pulling out empty cassette and docking a new cassette refill in its place until it snaps. Design features a sleek, contoured barrel with silver accents, top-click lead advance and a comfortable latex-free grip. Lead and eraser are refillable exclusively with Pentel Quick Dock Refill Pack..