The Otis FG380BP is a set featuring Otis\' innovative Bore Brushes. These are renowned for their proprietary Tufcor core wire designed to resist corrosion. The twine has a unique, tighter twist which ensures better retention of the bristles, offering double the filling compared to other brushes. What sets our brushes apart is that the bristles extend all the way to the end.Every 2-pack comes complete with a brush specific to a certain caliber. These are color-coded and have the size clearly marked on the stem for ease of identification. Additionally, each set includes a bronze and a nylon bore brush.This particular 10-pack assortment offers a wide variety of bronze bore brushes that cater to multiple calibers, making it an incredibly versatile choice for your needs.