Convert your Silhouette machine into a sketching/drawing tool with Sketch Pens. Use sketch pens to draw elaborate designs onto various material surfaces or to add a hand-drawn look to your projects.  This Ultimate Sketch Pen Set is a great way to jump into the world of sketching with your Silhouette tool. It includes all sketch pen colors offered from Silhouette so you can get a sample of everything! No tool adapter is required if you are using the Sketch Pens in the Silhouette Cameo® 3 and any of its previous models, the Silhouette Portrait® 2 and its previous model, and the Silhouette Curio®. A tool adapter is required if you are using the Sketch Pens in the Silhouette Cameo® 4. (Only the Sketch Pens with the black bodies are compatible with the Cameo 4 tool adapter.) Pen Tip Type: Rollerball Pen Tip Size: Fine (0.5 mm width) For use with: Silhouette Portrait®Silhouette Portrait® 2 Silhouette Portrait® 3 Silhouette Cameo® (original) Silhouette Cameo® 2 Silhouette Cameo® 3 Silhouette Cameo® 4 (with tool adapter) Silhouette Curio™