Features: Highly Scratch-resistant, tungsten is four times harder than titanium Fit: Comfort Fit, Style: Black Infinity Ring, Infinity Engrave Rings are Black, Dome Shaped, and feature a gorgeous Polish Finish Width: 8MM for His, 6MM for Her This beautiful ring set is made of Tungsten Carbide, classy yet elegant. Tungsten is extremely hard and dense. Combined with carbon and other elements, it becomes tungsten carbide, which registers between 8-9 on the Mohs hardness scale. Tungsten jewelry's roughly 10 times harder than 18k gold and 4 times harder than Titanium. In addition to Tungsten jewelry's design and high polish, part of its attraction to consumers is its technical nature.Hardness, assuring long lasting beauty. Permanently polished Tungsten Jewelry take a brilliant high polish and resist scratching longer than any metal ever offered to the public. Tungsten Jewelry will never bend out of shape. For people with sensitive skin, tungsten carbide is the perfect jewelry metal. Many people are allergic to gold, silver, or platinum, or more commonly zinc or nickel, which are used as alloys in most jewelry. You don't have to worry about this with tungsten jewelry, because tungsten jewelry is hypoallergenic. This means that you will no longer have to deal with rashes and discolored skin from wearing your tungsten jewelry. *** 30-Day Money Back Guarantee: We want our customers to be happy with our products. We offer 30-Day Money Back Guarantee. If you're not happy with our product for any reasons, you can return it for FULL refund within 30 days from the day you purchased.