[EFFECTIVE TRAINING]:(i)Training your dog is easy with a chain training collar, dog training slip collars are great for gentle control. (ii)Help your dog correct bad behavior and reduce aggression. [CHEW PROOF AND WEATHERPROOF]:(i)Made with premium quality stainless steel our collar is durable and wont rust or tarnish over time. (ii)The surface of the chain is perfectly smoothed to avoid injuries to the pets. [TRAINER RECOMMENDED]:(i)The collar is seamlessly welded, flexible, and freely adjustable. (ii)This collar helps correct bad behavior in dogs and is ideal for use in professional obedience training. [SIZES]:2.5mm diameter link x 20 inch length; for max neck girth 18 inch.Please measure the length of your dog's neck before ordering. [WHAT YOU SHOULD KNOW]:(i)If you have any questions during the use, please do not hesitate to contact us, we will reply to you within 24 hours. (ii) Our mission is to build high-quality dog products that allow you and your pup to do more things together.