Piano And Violin Finger Device Training Hand Grip
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Medium in size, perfect in feel, and easy to carry.
visual adjustment, adult MF4-1 (3-7 lbs), children MF4-2 (2-5 lbs).
There are 3 soft silicone protective layers on the bottom and top for a comfortable touch, non-slip and non-slip.
Each button is flexible, not loose, and durable.
ABS Guitar Piano Guitar Finger Exerciser Power Trainer Handle Grip Exercise Gym Workout.