Nee Doh got it right with this one.  

Not only is it filled with the softest most amazing filling, but it is in a cube shape!  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 beyond amazing and has a super soft dough feel.  You can poke and pinch it and it will retain its shape, then slowly ooze back into a cube just like a slow rise squishy would.

What it feels like - super soft cookie or bread doh inside a ball.  It is almost like a moving doh because when you release it slowly goes back to a ball shape.