Black Ion Plated Tungsten Carbide Men's Dog Tag Pendant with Black & Green Carbon Fiber Inlay ( 18" Ball Chain included) Pendant measures 1.8" tall X 1.2" 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