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1 comment of this product found across Reddit:
ZombieChief /r/Fitness
1 point
1970-01-19 01:24:24.564 +0000 UTC

These are commonly used by guitarists to build finger strength and hand endurance.

https://www.amazon.com/VariGrip-Therapy-Adjustable-Tension-Exerciser/dp/B0196HHNDY/