What is a Bore Brush, and What is it Used For?

Bore brushes consist of metal twisted or spiraled around strands of tiny hard material like plastic or metal filament. There are bore brushes that are designed like a bore mop. Therefore, instead of pieces of cotton that make up threads, which are tightly fitted together around a rod, they have filaments or threads of metal or plastic.

Read more: https://armoryden.com/what-is-a-bore-brush-and-what-is-it-used-for/