Coastal Pet Products DCP552018 18-Inch Titan Fine Chain Dog Training Choke/Collar with 2mm Link, Chrome Titan dog training choke/collar is excellent for gentle control This fine quality chain is argon welded and chrome plated for maximum strength and durability It will not tarnish, rust, or break and recommended for professional training Use only when dog is attended on leash and is sized by total length, including the rings Measures 18-inch overall length and 2.0-mm link diameter