1,Solid Material of Chain Collar: It is made of high-quality, hand-polished 316L stainless steel chain using German industry 4.0 laser fusion welding technology. The Chain diameter of S size is 2.0mm, Size M is 2.5mm and Size L is 3.0mm. It is durable, does not rust, and does not pull hair or tangle.2, About the Size: The collar is designed with 360°surround protection, and it comes in four sizes: S, M, L. The size S is suitable for dog neck size from 12"-16.5". Size M Suitable from 16"-21". Size L suitable from 20"-25". It is custom-fit and easy to wear, providing comfort for the dog.3, Why you need this collar: The collar is suitable for large, active breed dogs like English Bulldogs, Saint Bernards, Rottweilers, Newfoundlands, Pitbulls, American Bullys, German Shepherds, Huskys, and Belgian Malinois. It can be used for daily training, walking, and field trips to teach loyalty and companionship.4,A good walking chain：Double chains are strong and heavy because it is not hollow.This wailking Collar is very suit for All-Big Dogs! Put our collar around a strong dog to correct the dog's bad behavior, reduce aggression, and help teach interaction habits and walking styles. Recommended for Dogs From 10 to 80 Lb.Quality Assurance: JanToPet Focus our mind on pet supplies, We Will Offer the Most Satisfaction Support for Each Product, If There are Any Questions about the Product, Please Just Feel Free to Contact us. We will Try Best to Solve for You Within 18 hours. Product Description Chain Style 3-row chain 3-row chain 2-row chain 2-row chain Long Links chain Size 12"~27" 8"~22" 10"~25" 8"~22" 12"~24" Weatherproof Track Page Views WithAuctiva's Counter