This is the Kurodama Gundan (Black Ball Brigade) from the TV show "PythagoraSwitch." The Kurodama Gundan was made by hand, using wooden balls, marbles, and plastic balls, all painted black with a permanent marker. The largest one is about 7 centimeters in diameter. I made these for my child, who loves PythagoraSwitch. Suitable for those who don't mind used or handmade items.