CNC IS MOAR BETTER!!!! Humor aside, these are effectively a production version of a tool used by HSA to service guns for years. They're solvent resistant, flexible, with no head to pull off, and practically indestructible. Great for ramming out jams, scrubbing out bio BB residue, or giving your barrel that deep clean with harsh solvents like acetone that dissolve your typical glued-on-end ABS cleaning rod. Coil one up and keep it stashed in a pocket or pouch on your plate carrier. An indispensable tool. Please note these ship coiled up in a flat rate box, so will arrive slightly curved. They can be readily straitened, although don't need to be in order to function well.