For use on Brass, Zinc, Aluminum and all non-ferrous metals. For cutting or cut down to remove scratches and imperfections. Before coloring operation. Tripoli can also be used as a one-step cut and color bar. There are many different Tripoli formulations on the market all of which are roughly 75% Tripoli abrasive. The remainder being binder or greases that allow the formulations to perform certain ways for certain jobs. They can give more cut, less cut, more shine or less. They might run greasy or toodry. They might leave parts dull or shiny. Bayland carries a Tripoli for every scenario. 5A is an all around cut and color Tripoli. It has a fare amount of specail grease but it runs clean dry. It cuts very well but leaves a nice shine. It can be used on all non-ferrous metals. 5A was specifically formulated for zinc diecastings but works excellent on aluminum, brass, copper, and gold.