The Ultimate Outdoormen is made out of Elk Antler, Antler Species of your choice or your own personal antler. This design also features a Dual Raw Gold Nugget inlay. A Titanium band is used for strength and durability. Millimeter varies depending on size of ring. Can be made in sizes 8-15 If a bigger or smaller size is needed please email me or contact me (Stephen) @ 541-414-7938 All sales final.