Cleans gun bores in 10 seconds! Cleans from the breech without disassembly, can’t harm bore or crown. Initial floss, built-in phosphor bronze brushes and main floss remove powder residue, metal fouling and hardened deposits. Completely washable by hand or in washing machine. Ideal for guns that are difficult to take down. Compatible with most solvents and gun oils. Caliber stamped on brass weight for easy identification.