The new Wacom Ballpoint Pen for Bamboo Folio and Bamboo Slate features a 1.0 mm pen tip and a cartridge filled with black, oil-based ink. The oil-based ink and medium diameter allow for quick, free sketches with more durable ink. When using one of these smart pads, every stroke is captured precisely and without loss in a digital format. The Wacom Ballpoint Pen comes with three replacement cartridges. This pen is a replacement pen for Bamboo Folio and Bamboo Slate.