This is a set of SideM pin badges. I purchased them at a used goods store several years ago, so the details such as the release date are unknown. Price reduced slightly. THE IDOLM@STER SideM Pin Badges Ryu Kimura, Seiji Shingen, Yukihiro Kamiya, Yusuke Aoi, Kyosuke Aoi, Aslan BB II, Kyoji Takajo, Kuro Kiyosum, and Kirio Nekoyanagi