This is a glow-in-the-dark, phosphorescent type. I ordered and purchased this the other day, but I received a larger quantity than I needed. It might be suitable for someone who can fix it themselves, or perhaps for a man. There are 22 beads of 10mm each. Hotaru glass is a glass bead with a hole, made using a shaping technique called burner work, similar to tonbo-dama (glass beads). Artisans melt colored glass onto an iron core, round it, and layer silver foil onto the molten glass, like syrup. They then use a special technique to create beautiful colors. ◆Panari Blue Panari Island refers to Kamijijima and Shimojijima, islands in the Yaeyama Islands. These two adjacent islands are collectively called "Aragusuku Island," but as a remote island from Ishigaki and Iriomote, it has been affectionately known as "Panari Island (remote island)" by the locals since ancient times. Surrounded by coral reef seas boasting miraculous transparency even within Okinawa and Yaeyama, its beauty is said to surpass even the感動 of "Kerama Blue" and "Ishigaki Blue." Panari Blue Hotaru glass recreates the white sandy beaches and the endlessly expansive, incredibly beautiful emerald green sea of Panari Island. ◆Bead size: 10mm (±1mm) ※These beads are handmade, one by one. There may be variations in color and beads that are not perfectly round.