Finger Gym, Silicone Finger Trainer – Save Your "Muscle Weakness" Fingers! Still envious of others' nimble fingers when playing the piano or gaming? Jiayuan Food-Grade Silicone Finger Trainer is here to help you turn things around! It's like giving your fingers a VIP gym membership; just 5 minutes a day will help you say goodbye to the embarrassment of "even tapping the screen is difficult."