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: 39cm **Please be sure to measure your dog's neck circumference before ordering (size with enough room for one finger) Holes are: ● 39 ● ● ● (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, and other items, 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 "collar studs" on Rakuten Shop and Yahoo! Shop Mall.