This is a scientific toy called "Chikyu-Goma" (Earth Top) from Tiger Shokai, which went out of business 20 years ago. It utilizes the principle of the gyroscope effect. The top surface is pink, and the bottom surface is green. It is 6cm tall. It was stored in a dark place after being used a few times. - Product Name: Chikyu-Goma No.A - Brand: Tiger Shokai - Color: Pink - Color: Green - Accessories: String This is the lowest price, so please consider.