Material of This Dog Collar: Pure 18K gold over copper, and gold is 20X thicker than other regular plated chain. High strength and hardness, heavy, durable, no rust, no tarnished for years of use. It is easy to lock and unlock the clasp, but it is very strong that cant be pull it apart even with 500lbs of forceChain Leash Sizing and Fit: Chain wide of 5MM Thick, Totally Length of 4.3FT;Who Need this Chain Leash: Do you have a chewy dog? If yes, this Lead is perfect The luxurious chain leash looks cool on both boy and girl dogs. 5MM wide, and 4.3feets length is good for Small Medium dogs like Rottweiler, Pitbull, American Bully, German Shepherd, Husky, Newfoundland, Belgian Malinois, Pitsky Saint Bernard, English Bull and so on.What Does This Chain Like: Training Walking Chain is solid and heavy because it is not hollow. High polished craftsmanship makes the surface shinny and smooth, comfortable, so we believe your dog will be happy to own this lead. It is very strong and never worry about breaking down.