These rings are made of 316l stainless steel. Stainless steel is highly resistant to scratches, tarnishing, and corrosion, strong and durable, never fade, never rust, water proof,suitable for any occasion, such as wedding, working, hiking, sporting, etc we vacuum electroplate these rings, which does not contain impurities, provides a smooth surface. By vacuum plating, our stainless steel rings have better waterproof, not fade, durable and smooth surface In order to improve the quality and comfort when wearing, our rings have matte surface and smooth inner surface, will not scratch your skin. comfortable to wear.Aging process make the ring look more vintage and unique 8mm rings is classic width,and they are more comfortable and eye-catching than rings of other widths, and 8mm stainless steel rings are not easy to damaged. If you are looking for a solid ring, this ring will be a good choice for you. The solid ring symbolizes your feelings are not to damaged, and it also show enduring companionship. At any moment, you can give this simple ring as a surprise to your friends or family