Frank S.Burton 6mm Tungsten Heartbeat Rings for Men Women EKG Heart Beat Wedding Band Comfort Fit Size 4-12 Genuine tungsten carbide and cobalt free, stronger & tougher tungsten ring Workmanship: carbon fiber heartbeat cardiogram laser pattern design, comfort fit for men and women 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