A Skrunch! is a kind of stress ball that is made to do hand massage exercises independently. You can train muscles of the hand and fingers very effectively with it. Very useful for rehabilitating or for building muscle strength, to be able to train further later with, for example, a Powerball.
The skrunch is made of a double layer latex coating to prevent tearing.
The color of this skrunch is black.
The skrunch is filled with 300g micro silica crystals.
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