Frank S.Burton 6mm/8mm Tungsten Black Rings Tungsten Ring Tungsten Carbide Wedding Band Size 4-15 Black Tungsten Carbide Wedding Ring, Comfort Fit for Men and Women. Workmanship: 6mm and 8mm wide for couples who desire a matching set Best value: unisex tungsten wedding band, accurate size & anti-allergic to your finger, best gift for engagement, wedding, promise, Christmas, valentine's day Durable & Heavy: tungsten ring would never bend, it is strong and tough Service and Insurance: friendly customer service and life-time quality guarantee including 30 days money back and exchange