This is a 3cm wide leather collar for small dogs. 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. If it's not available, please contact us. ● Size: Leather width: 3cm Thickness: approx. 3mm Neck circumference: 25cm **Please measure your dog's neck circumference before ordering (size with enough room for one finger). Holes are: ● 25 ● ● ● (1.2cm intervals) Please confirm. **Measure from the edge of the leather (not from the edge of the buckle hardware). +++++++About Extra+Heavy+++++++ Extra+Heavy is a custom-made collar shop that specializes in half-choke collars, leads, etc., mainly for bulky collars for bull breeds and long-necked dogs like Italian Greyhounds. The sites are Rakuten Shop, Yahoo! Shop, and the main store. * You can find Extra Heavy by searching for "collar studs" on Rakuten Shop and Yahoo! Shopping Mall.