Why this ring?1. Stunning and elegant polished shiny2. Extremely solid and durable3. ,outstanding scratch resistance and gloss retentionComponent List:Tungsten Carbide-----85.7% Ni-----9.5%(Nickel Release 0.26 microgram/cm2/week, completely meet the standard of EU Nickel Release Directive 2006/96/EC)Ta-----1.8%Ti-----1.5%Nb-----1% Cr-----0.3%others-----0.2%Caring Tips:1. Clean the ring with warm water and mild soap (no detergents).2. Tungsten carbide is a very hard and dense metal with hardness between 8.5 and 9.5 on the Mohs Hardness Scale (diamonds are a 10 - the highest). However, metal with extremely hardness usually with certain degree of brittleness. Your ring should never be tossed or impacted violently.3. Avoid exposure to chemicals and keep it in your TAN'S gift box when you are not wearing it.About TAN'S: TAN'S aim to create jewelry that never fades charm. We hope you can recall your beautiful memory when you touch your shining TAN'S ring after decades of years.