Official SKE48 merchandise. I am selling this because I no longer have the opportunity to use it. I have only used it a few times, and there are no noticeable stains or marks. The batteries were dead, so I put in new ones. This is a 10-color glow stick that you wear on your arm! It lights up in 10 colors: orange, red, yellow-green, blue, white, pink, yellow, purple, green, and yellow. You can hold the glow stick in your hand and also wear it on your arm, so it's easy to be seen.