What's this Hana has? It's not an exercise machine to build your arm muscles. Most people in Japan sleep on futons on the floor (we do). On sunny days, people hang their futons or covers over the railing of the balcony to air them out. It's well known that strong sunlight kills bacteria and prevents mold. I don't know the exact name, but this is a futon clip like a giant clothes pin. It keeps the futons from flying away. Isn'tthat interesting?