ORB Odditeez Ultra Slimiballz
Orb Odditeez manufacture squeeze balls that might look like most of the cheaper variants you find, but they are significantly stronger. Made from a thicker, durable rubber, they last longer and are almost impossible to break. (Almost)
The Ultra Beadiball a waterbead-filled ball that is simply awesome to play with, squeeze and a lot of fun. These are also ultra sizes, so they weigh about 400 g and are almost 12 cm in diameter, much larger than the standard squeeze balls.