I purchased this about a year and a half ago and stored it after using it about 4 or 5 times. I was using it layered with my main Phiten necklace. However, the balance was off, so I stopped using it. The clasp clicks shut on both sides. Phiten Necklace RAKUWA Metax Round Color: Silver/Black & Gold (The color of the removable logo part looks brown-metallic rather than black) Size: 50cm (actual size 49.5cm) Material: Cord (outer fabric)/Polyester, Nylon Cord (inner core)/Elastomer Clasp/Pure Titanium, Internal parts/Aluminum, Polyacetal Accessories: None, body only Technology: Metax The following is a quote from Phiten: [Beautiful, streamlined form] This RAKUWA necklace uses the highest level of "Metax" technology. The rounded, beautiful form of the clasp is made of luxurious pure titanium. The simple, slender cord is easy to wear for both men and women, and it is an item that combines design and power, bringing out the charm of adults. ・Sophisticated round design A streamlined, beautiful form that curves along the neck. A slim, simple design that is easy to wear for both men and women. ・Employs the highest level (compared to our products) of Metax technology The cord part is equipped with Metax technology for the first time in a RAKUWA neck. ・One-touch attachment and detachment The pure titanium clasp can be attached and detached with one touch on either the left or right side. Please understand that this is a used item as it has been in someone's possession once.