Foto4easy Guitar Beginner Hand Exerciser Finger Strengthener Trainer (Orange) 5 buttons initiated, one more button than the common exerciser. Soft button cap makes it comfortable to press. The slim size makes you hold it all in one palm. Copper core, adjustable tension, make operation smooth and accurate. With 2 brackets, any two of the buttons can be held down. You can choose whatever fingers you want to exercise at your will. Can lock 2 buttons simultaneously.