1. What's this Dog Collar made of? : It's black over 316L stainless steel chain, and the black plating is 20X thicker than other gold plated chains. High strength and hardness, heavy, durable, no rust, or tarnish, ensuring many years of use! We designed a unique, attractive snap buckle; please check the details showing in the picture. It is easy to lock and unlock the clasp and is very strong so that it can't be pulled apart even with 700lbs of force! 2. Collar Sizing and Fit: Chain width is 19MM(0.75 in), Available length's are 15 to 26 inches. Please note that this chain is NOT adjustable, measure around your dog's neck with string or tape where you want the collar to lay, and then add about 1 2inches. 3. Who Needs this Collar? : Do you have a dog that likes to chew? If yes, then this Collar is perfect! The luxurious Cuban link chain collar looks cool on both male and female dogs. 19MM wide, and 12 inches to 26 inches long, it's designed for large active breed dogs like Rottweilers, Pitbulls, American Bullys, German Shepherds, Huskys, foundlands, Belgian Malinois, Saint Bernards and English Bulldogs it can handle the rough breeds.