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 Sketch Pen Basics Pack provides you with the most common colors of the rainbow. 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 Cameo® (original) Silhouette Cameo® 2 Silhouette Cameo® 3 Silhouette Cameo® 4 (with tool adapter) Silhouette Curio™