Material of Dog Chain Collar: 18K Gold Over Hand polished 316L stainless steel chain collar. Chew Proof, Durable, No Rust, No Tarnished for years of use! We design a couple of O rings for your dog leash, and it is simple, smooth, beautiful, wont hurt the chain. How to Choose the Correct Size for Your Dog?: Chain Wide of 10MM (0.4); Available Length of 10" to 24". You need to confirm that the size you bought can over your dog's head, because this is a P Chain Choker. We advise that measure around your dogs neck and head with string, and then add about 1-2 inches. For example, the widest of your dog head is 17.5, and neck is 14, then please choose 18 or 20 for your dog Training Walking Choke Chain: This is a P-Chain, and what is it? P chain will tight your pet neck if you pull it, so that your pet will stop walking. If your dog frequently chew through or pull a lot, or break chains, this collar will be a best gift for him. The luxurious cuban link chain collar looks cool on both boy and girl dogs. 10MM wide, and 10inch to 24inch, it is for dogs like Rottweiler, Pitbull, American Bully, German Shepherd, Husky, Newfoundland, Belgian Malinois and so on. How is This Chain? The Links are 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 collar. The welded stainless steel O rings for attaching tags and dog leash, it is very strong and never worry about breaking down.