I would NOT recommend this for younger toddlers, our kids that put toys in their mouths. I don't think it would like a lot to chew threw these, however, my kiddo is 4 and he loves to build and these are so much better than toy boats and plastic fish! I love that there is an easy clean up bag for them too. Nothing to get water stuck in. To clean them you can just spray them down with bleach and water. They are perfect for preschoolers and up!