This is a half-choke collar for small dogs, 3cm wide. 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. It has a calf hair print. Some adjustment is possible, but please measure your dog carefully and order the correct size. 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: 3cm Thickness: Approximately 3mm (may vary slightly depending on the leather) For dogs with a head circumference of about 28.5cm (Please note that this size does NOT include the +2cm added to the head circumference as described in the measurement instructions for small dog half-choke collars on our website). Please compare this with the size of the half-choke collar you already have. ● Leather part size: Approximately 24cm (at the hole position in the photo) ● Chain size: Approximately 9cm (The reason the total size 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 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 custom-sized collars, including half-choke collars and leads, mainly for bulky breeds and 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.