Each wheel has needle sharp, hardened teeth, beveled
to a good point. They run freely and swivel easily. Smooth aluminum barrel.

This fresco pouncing tools set includes the following tools:

· Coarse tracing wheel - 7/16" diameter, 15 teeth per inch.
· Coarse tracing wheel - 1/4" diameter, 15 teeth per inch.
· 6 oz. bottle of superfine, 100% pure artist-quality charcoal - willow type, extra soft, intense black.
· Cloths, rubber bands, and instructions to make pounce bags.

Here is how to use it! "A Good Pouncing" - article