This is a very fun stress toy that is not only calming, but it also helps build hand and finger muscles and bilateral coordination. It is a jumbo ball that is filled with a stretchy taffy like doh which makes it a large moldable stress ball. The ball is 4" when it is round, but can be stretched out! This is very calming because it has a very silky soft feel, and you can pull and indent it multiple ways. I like it because you can turn it and pinch it just like you did in elementary school when you made pinch pots with clay. You need to feel it to really know how nice these are.