This is a 2.5cm wide half-choke collar for small dogs. The size is for dogs with a head circumference of about 27.5cm (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 carefully and order. 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: 2.5cm Thickness: Approximately 3mm (may vary slightly depending on the leather) For dogs with a head circumference of about 27.5cm (Please note that this size does NOT include the head circumference + 2cm as stated in the measurement method for small dog half-choke collars on our website). Please compare the size with the half-choke collar you already have. ● Leather part size: Approximately 23cm (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 custom-made collar shop that specializes in half-choke collars, leads, etc., mainly for bulky collars for bull breeds and collars for long-necked dogs such as 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.