Tipton's Bronze Bore Brushes are perfect for all your cleaning chores. The core is a single piece of wire that is looped on the end, so it will not scratch your bore. The bristles are made from premium phosphor bronze, for a superior blend of cleaning power and long life. The nylon brushes feature Nylon bristles that are unaffected by Ammonia based solvents with galvanized plated wire core with looped end and a crimped coupler.