Could this help people with hand spasticity?

One can buy this rubber suction ball for as low as 2$, and I believe it may help people with hand spasticity (like after stroke) in grasping objects during daily living.

This video shows how:
I do not make any money for this, but sincerely hope it can help someone - and if you are interested in this (for feedback or collaboration), please get in touch!
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