This oobleck stress ball feels SO COOL! We had a great time learning how to make oobleck last year, and this stress ball version offers all the fun without the mess. Simply fill a balloon with cornstarch and water to make this DIY craft that's great for relieving tension! When you squeeze the ball hard, the oobleck stress ball feels a bit similar to a flour stress ball. But if you gently poke at it or let it sit in your hand you can really experience the unique oobleck texture. It's such a cool experience, and a really easy activity