Size: S-3.0mm × 50cm, weight 105g. Pretty silver. It is suitable for medium and large dogs as well as very uncontrollable dogs. Material: Made of high quality steel, chrome plated to ensure stability. The surface of the chain is completely smooth to avoid injuring the animals. Resistant: Thanks to its chain structure, the collar is durable and very resistant to bites. The chrome layer makes the collar waterproof and rust resistant. Please note that do not leave the necklace in the water or in the rain for a long time. Please dry it with a dry cloth as soon as possible after it gets wet. Exercise: Good design for exercise and other daily activities. The idea of a choke is to train a runaway dog by making sure you are in control when the dog pulls hard. INSTRUCTIONS: The collar consists of a chain and 2 identical O- rings at the end of the chain and is used a little differently than the classic necklace. Attach one of the loops to the leash, thread the chain through that loop with the