The first Oura ring is made of a high-tech ceramic compound called Zirconia (ZrO2). The inside molding is a medical grade, 100% non-allergenic, nickel free, and non-metallic material that makes the ring feel very comfortable on the finger.
The ring material is scratch resistant and waterproof to 50m /164 ft, so it's safe to wear the ring while taking a shower, a bath or during swimming. The ring can also withstand hot temperatures, so it can be worn while in a sauna.
The first Oura ring comes in three different finishes, glossy Mirror Black and Arctic White, and the exclusive matte Stealth Black.