This collar is designed to prevent strangulation accidents. Dogs collars can get snagged on so many things: fences, decks, kennels and crates, bushes, floor grates—even other dog’s teeth. The KeepSafe patented break-away safety buckle prevents strangulation accidents by releasing when pressure is applied to the buckle. It can be used securely with a leash by fastening the leash to the two D rings. Made of nylon strap, fabric fastener, and metal hardware.