Tungsten carbide is the newest metal used for wedding bands and with good reason. Tungsten alone is a very dense and brittle metal, but when combined with a carbon alloy it becomes Tungsten carbide which is the strongest metal known to man.With a hardness between 8 and 9 on the Mohs hardness scale (diamonds are a 10 while silver is a 3), Tungsten carbide is 10 times harder than 18K gold, 5 times harder than tool steel, and 4 times harder than titanium.Tungsten rings hold their shape better than any other type of ring and are easy to clean. All you need is a damp cloth and with one swipe your Tungsten wedding band will look new like the day you bought it. FREE ENGRAVING on the INSIDE of the ring up to 25 characters Great for any name or names with (heart logo) in between and a date or very short message If you are not sure about your ring size the best way to find out is to get you finger sized at your local jewelry store. Product Info: Model: TR166 Ring Sizes: 7-8-9-10-11-12 Width: 8mm Material: Tungsten Finish: Flat High Polish, Brushed Center SKU: B101 Comes in Gift Box