The QUASAR Band Design by Thorsten is a quality Comfort Fit tungsten inlay ring made of jewelry grade Tungsten Carbide. The ring has polished beveled edges and an inlay of Laboratory Grown Blue/Green Opal stone. This style ring comes in 4mm, 6mm, 8mm, and 10mm making it great for couples who prefer a beautiful matching set tungsten wedding bands. Tungsten Carbide is the newest and strongest metal to be used in jewelry, ideal for men and women who want something lasting and that will not scratch easily. Free Lifetime Sizing and Lifetime Warranty on all THORSTEN tungsten rings.