This is a 3cm wide leather collar for medium-sized dogs. This is a one-of-a-kind finished product (sample) and is a bargain. Please contact us if you want a different size or color. ●Size: Leather width: 3cm Thickness: approx. 4mm Neck circumference: 36cm **Please be sure to measure your dog's neck circumference before ordering (size with enough room for one finger) Holes are: ● 36 ● ● ● (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 handmade collar shop that specializes in custom-made collars, such as half-choke collars and leads, mainly for bulky collars for bull breeds and long-necked dogs like Italian Greyhounds. The website is a Rakuten shop, a Yahoo! shop, and the main store. *You can find Extra Heavy by searching "collar studs" on Rakuten Shop and Yahoo! Shop Mall.