This is a half-choke collar for large dogs, 4cm wide. The size is for dogs with a head circumference of about 47cm, and it can be put on and taken off over the head. It can be adjusted, but please use this size as a base. This is a one-of-a-kind finished product (sample) and is a bargain. If you want a different size, please order from Yahoo! Shopping. Leather width: 4cm Thickness: Approximately 4mm (may vary slightly depending on the leather) Head circumference: 47cm (at the hole in the photo; can be adjusted slightly) ● Leather part size: Approximately 35cm (at the hole in the photo) ● Chain size: Approximately 15.5cm (The reason the total doesn't match the ordered head circumference is because the chain and leather overlap, and it's calculated to be a size that can be put on and taken off over the head.) Please contact us if you don't understand. ++++++About Extra+Heavy+++++++ We have many other items for sale, so please take a look. Extra+Heavy is a handmade collar shop that specializes in custom-sized collars, including half-choke collars and leads, mainly for bulky collars for bull breeds and collars for dogs with long necks like Italian Greyhounds. Our sites are Rakuten Shop, Yahoo! Shop, and our main store. * You can find Extra+Heavy by searching for "collar studs" on Rakuten Shop and Yahoo! Shopping Mall.