Eureka Seven AO x JAM HOME MADE Bangle SILVER Size S [S: Inner diameter: Width 58 x Height 45 x Width 4 (mm), Inner circumference approx. 16 (cm)] It glows in the dark due to the luminous material. (See images 4 and 5) The size didn't fit, so I kept it in the box without using it. The pins that came with the purchase are unopened. The following is a product description from the HP: "JAM HOME MADE" co-developed from the planning stage, this is a "glowing bracelet" that is an important item in the story. This model is made of SILVER925 material, and the polypropylene cord wrapped around it glows in the dark. Inspired by "memory," the end of the bangle is designed with the "Ryukyu knot" of Okinawa, one of the settings of the story, and the motif of a "crystal oscillator." *Crystal oscillator: Uses the piezoelectric effect of quartz (crystal) and is connected to an electric circuit to oscillate at a constant frequency. Used in quartz watches. Psalms of Planets Eureka Seven Eureka Seven AO