This is a set of finger and hand grip strengtheners.
They are designed to improve finger strength, mobility, and overall grip.
The devices feature different resistance levels, indicated as 13LB, 17LB, and 21LB on the black version.
They are made of silicone and are portable, making them suitable for use at home, the gym, or while traveling.
These are commonly used by athletes, musicians, and individuals undergoing hand therapy to prevent injury or relieve pain from conditions like arthritis.