This is a harako leather collar for medium-sized dogs. This is a one-of-a-kind finished product. If you want a different size or color, please order from Rakuten or Yahoo! Shopping. ● Size: Leather width: 3cm Thickness: approx. 4mm Neck circumference: 42cm **Please be sure to measure your dog's neck circumference before ordering (a size that allows for about one finger's worth of space). Holes are: ● ● 42 ● ● ● (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 specializing in half-choke collars, leads, etc., mainly for bulky collars for breeds like bulldogs 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 "collar studs" on Rakuten Shop and Yahoo! Shopping Mall.