VITEROU Unisex Twill Engraved Tungsten Carbide Ring Pattern Polished,Black Color,Size 7-13 (9) MATERIAL:High polished tungsten carbide ring black color,cobalt free DIMENSIONS:25mm diametre,width 8mm,thickness 2.5mm VERY STRONG & DURABLE : Tungsten is approximately 10 times stronger than 18K gold,you can keep it looks stylish in many years GUARANTEE:Viterou tungsten ring scratch and fade resistant, as well as being hypoallergenic,we guarantee 30 days money back guaranteed,we'd refund your money, no questions asked. PERFECT GIFT: Free elegant velevt bag make it perfect gift choice for any occasions.