5 buttons initiated?? one more button than the common exerciser</br>Soft button cap makes it comfortable to press. The slim size makes you hold it all in one palm</br>Copper core?? adjustable tension?? make operation smooth and accurate</br>With 2 brackets?? any two of the buttons can be held down. You can choose whatever fingers you want to exercise at your will</br>Can lock 2 buttons simultaneously</br></br>Product Description</br></br><p><b>Introduction:</b></p> <p>This finger trainer is designed for all instrumentalists?? no matter the beginners or the professionals.?<br> It has exquisite design?? small-sized and simple. 5 buttons make your all fingers get the effective and useful t