These are yo-yo balloons, which are a typical toy and prize at Japanese festivals. They're simple; a small balloon with a little water inside, tied with a rubber band. Put it on your finger and bang away. loads of fun. They're a game prize. All the balloons are put aloat in a small mini-pool. You pay for your chance, and the staff will give you a little tissue paper rope with a little metal hook. You dip your hook and fish for one of the rubber bands to get your balloon. If really good you can hook more than one, but remember, as soon as the paper getswet, it'll get weak and start to tear.