Horizon: 4mm Comfort Fit Domed Couples His n Hers Wedding Band Ring Tungsten Carbide, 3046A Slender 4mm wide design; a great choice for both men and women alike. True Comfort Fit Tungsten Carbide wedding band (contoured on the inner surface for a more comfortable fit)! Highly scratch-resistant and very easy to care for; Tungsten Carbide is four times harder than Titanium. While Tungsten Carbide is an extremely hard metal, it can crack or break under certain circumstances. This property does mean that it's readily removeable by medical personnel in emergency situations. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.