These collars are made from Weaver Select English Bridle Leather. They have a tapered design. The body of the collar is 1 1/2" wide and it is tapered down to a 1" buckle. The buckle is Stainless Steel with a matching D-ring for you leash. You may choose to add a name tooled into the leather. For sizing, measure you dogs neck in inches or measure their existing from the buckle to the hole you are using.