The Chain Reaction Collar is a martingale collar with chain. It combines reflective Tubelok? webbing and a short section of stainless steel chain. The limited-cinch martingale design is popular among dogs who have a knack for slipping out of traditional collars. Packed full of Ruffwear's signature collar features: separate ID tag attachment point, a silicone tag silencer, and strong and comfortable webbing that holds its color.