The Pro-Staff Elite Carbon Fiber Edition is made out of Elk Antler, Exotic Ebony and has a Dual Gold nugget inlay out of gold from the rivers of Alaska. Also featuring a Carbon Fiber band to make this design so lightweight, you don’t even know you’re wearing it. This design can also be made with other species of antler. Millimeter varies depending on size of ring. Can be made in sizes 7-16 If a bigger size is needed please email me. All sales final.