LASER ENGRAVING SERVICE 8MM Cobalt Chrome COMFORT FIT Polished / Satin Brushed Finish Wedding Bands with Grooved Edge for Men 4X Harder than Platinum, 5X Harder than Gold, and 7X Harder than Silver. ****PLEASE NOTE: ENGRAVED ITEMS CANNOT BE RETURNED OR EXCHANGED **please review our item description for details Hypoallergenic, scratch resistant and biocompatible. This metal can be found inside the human body with out harm Cobalt... unlike Tungsten is shatter proof. All Cobalt Rings purchased from Jewelry Vortex will include FREE-SHIPPING