These Multi-Use tips, all unique to Razertip, are probably the most versatile tips in the history of pyrography. They can all be used for fine feather and hair detail, widegroove detailing, and carving or relieving feathers and quills. They can also be used for scaling, shading, and calligraphy. They are the only tip that can simulate "stoning" effects as well as "rippling" on feathers Their unique shape makes them very tough and durable. They are availble in 5 sizes - from extra-small to extra-large. Medium and large are the most popular. The small version is very useful for smaller songbirds around the size of a chickadee. The extra small version is great for miniatures and fine detail work.