Unused item. Purpose: This is a multi-functional brush used for maintenance of coffee grinders, filters, etc. Materials: One side is made of white hog bristles, and the other side is made of PBT tapered bristles (synthetic fiber). This allows for cleaning that takes advantage of the characteristics of each type of bristle. Features: It is designed to easily brush out coffee grounds that have gotten into small crevices, and its anti-static properties help prevent powder from sticking.