This is a 2cm wide half-choke collar for small dogs. The size is for dogs with a head circumference of about 28.5cm (at the hole position in the photo) and can be put on and taken off over the head. Some adjustment is possible, but please measure your dog accurately before ordering. 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: 2cm Thickness: Approximately 3mm (may vary slightly depending on the leather) Head circumference: About 28.5cm for dogs Please compare this with the half-choke collar you already have. ● Size of the leather part: Approximately 24cm (at the hole position in the photo) ● Chain size: Approximately 9cm (The reason the total does not equal the ordered head circumference is because the chain and leather overlap, and it is calculated to be a size that can be put on and taken off over the head.) Please contact us if you are unsure. +++++++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 size-ordered collars, including half-choke collars and leads, mainly for bulky collars for bull breeds and long-necked dogs 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.