Brush Fill Materials

A wide variety of fill materials are available:

* Synthetic fibers including nylon and polypropylene from sizes .003 to .115
* Abrasive filaments - nylon impregnated with silicon carbide or aluminum oxide in
   sizes ranging from 60 grit to 600 grit
* Nylon impregnated with fiberglass
* Ferrous and non-ferrous wires from sizes .003 and .072
* Natural bristle
* Animal hair