3COINS Mysterious Ball Used only indoors, so there are some minor scratches, but it's still in good condition. This is a curious ball that flattens when stepped on and returns to its original shape over time. The kids loved playing with it, but they've outgrown it, so I'm selling it. We enjoyed the thrill of not knowing when it would bounce back. Size: Approximately 15cm in diameter x 14.5cm in height Indoor play, spring, mystery, ball, Ball