This ring is stainless Damascus steel with a Dinosaur Bone inlay stripe. The ring is handmade using stainless Damascus steel. I hand shape these rings to the desired dimensions and then etch them with a process using an acid etchant. The inside and the outside are both slightly rounded by hand to give a very comfortable fit. The ring shown is 6mm, but you can choose 4mm, 6mm, or 8mm. If you have a specific request, please don't hesitate to message me. We would love to hear any thoughts you may have. This Damascus is made up of aeb-l and 302 stainless steels. The dinosaur bone is from a Utah Sauropod. Contact us if you would like a specific species and we will try to obtain it.