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RoygraDirect via Amazon [amazon.com] has 8-Pack roygra Grip Strength Trainer Hand Exercise Set on sale for $7.99. Shipping is free w/ Prime or on orders $35+.

From Merchant’s Product Page:[list][*]Specs:Material: Silicone
Weight: 0.29 kg
Tension levels: Multiple (light, medium, heavy)
[*]Includes:[list][*]Hand exercise balls (2.15″ x 1.63″) x3