Ball Holder M Size / ① Vertical Belt Loop This is a tool that allows you to attach a ball to your body. ◎ Balls with weak surface friction (e.g., plastic) M size: 60-90mm ◎ Balls with strong surface friction (e.g., rubber) M size: 60-84mm ※ If the size exceeds the upper limit, it may not be possible to attach and detach smoothly. I bought this because I thought it was interesting from Kizo wa Kobo, but I never had a chance to use it, so I'm giving it away.