I found a super ball that was popular in 1965, and it's 5 centimeters in diameter. Nostalgic! I was in the second grade of elementary school, and I was the only one in my class who had one. It was a super ball from America. It was a craze! I wonder if this one is made in Japan. They were hard to get back then. I begged my father for one, but he always brought back different balls. I treasured the fragments I picked up. The dark green balls were my favorite. Maybe this is one of them? It bounces and bounces. It has a small scratch. It was fun throwing it on the elementary school floor.