Men's Tungsten Carbide Dog Tag Pendant with Blue Carbon Fiber Inlay ( 18" Ball Chain included) Pendant measures 1.6" tall X 0.8" wide High Polished and Cobalt Free Tungsten Jewelry 10 times harder than 18K Gold, 5 times harder than tool steel and 4 times harder than titanium Scratch and wear resistant Although it's one of the hardest metal, it might still break and shatter if drop or hit on sharp corners