Bronze titanium necklace for enhanced performance. - Product Name: OPA NECKLACE MAG TITAN - Size: L: 51cm - Material: Titanium - Color: Bronze This is a limited edition color for the 1st anniversary model. It is sold out at the Harajuku store pre-opening and online store. It is also listed on another site, so we apologize, but we will process orders on a first-come, first-served basis. Thank you for viewing.