3mm Blue Plated Tungsten with the plating covering the inside and outside of the ring. Scratch proof, durable and made for a Man. Great gift. We offer custom engraving with your personal message on each ring. To have your ring custom engraved please select a size and width from the drop down menu and then "YES" from the Custom Engraved drop down menu. Enter your message (limited to 25 characters) and choose your font. Please make sure your size and message are correct before submitting. We do not offer refunds on custom engraved rings.