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FEX4. Ortega Finger Trainer 4 pistons.

The original Ortega Guitars FEX4 is an advanced pocked-sized, lightweight training tools for different needs. The FEX4 help you to build up strength for the entire hand and forearm.
Adjustable tension for each finger with 3-7 lbs (appx. 1.3-3.2 kg) & 4individual tension adjustable pistons for more training possibilities.
Train and maintain strength for your fingers, palm and forearms, supports reaction speed, flexibility and other high difficult action training.