Need an excuse to drink coffee? What if you could train your finger strength in your coffee break? At the very least, you can impress your friends by showing off your grip strength! Hold on tight and don’t spill your coffee!
Orange: level 1, easy
Green: level 2, medium
Black: level 3, hard
Brand: YY Vertical, Y&Y Vertical
| Colour | Black, Green, Orange |
|---|
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