This is a stuffed animal toy for babies. The ones with strings can be tied to strollers or mobiles. The small fish vibrates and returns to its original length when pulled. The fish, frog, and rabbit make sounds when shaken. The bear makes a sound when pressed. I have washed them at home, but if you are concerned, please wash them again before use. The rabbit can be put inside the ball. This one is a toy from Akachan no Shiro (Baby's Castle).