This is a collar with 10mm flat-tipped rivets. It's low-profile, so it's not dangerous. 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: Approximately 4mm Neck circumference: 35cm **Please be sure to measure your dog's neck circumference before ordering (size with enough room for one finger).** Holes are: ● 35 ● ● ● (1.2cm spacing) 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 heavy-duty collars for bully breeds and collars for long-necked dogs like Italian Greyhounds, as well as half-choke collars and leads. The website is on Rakuten Shop, Yahoo! Shop, and the main store. *You can find Extra Heavy by searching "collar studs" on Rakuten Shop or Yahoo! Shopping Mall.*