These colors don't run, but with the quick and easy-to-clean NiB-X nickel boron coating, powder residue and fouling sure do. Every component of this Full Auto Bolt Carrier Group is deemed operator-grade by industry heavy-weight WMD, and coated with NiB-X technology that provides a permanently lubricious surface for minimal lube requirements, while reducing cleaning efforts to the simple wipe of a cloth.Note: Not available for international sales.