Users can adjust the spring compression on each finger plunger easily?? 7 tension level available?? from 3.0 - 8.5lb</br>Two exclusive "y-hold" offered??develop the flexibility of training each finger</br>Portable in lightweight (3.88 oz)?? dimension (4.13".6"x0.91") ??can build strength without stress anywhere and anytime</br>Soft botton and high quality string elasticity?? operate smooth and accurate and eliminated buzz</br></br>Product Description</br></br><b>Compatible for musicians?? athletes and even physical therapy?? wide range of tension from 3.0 to 8.5 lb can help users to create their own training solution for fingers?? hands and forearms. <br>Perfect slim size makes it easy to use in one hand??built strength without stress.<br><br><b>Specifications:<br>Two colors available : Grey ?? Orange<br>Dimensions: 4.13".91"<br>Press button quantity : 5<br>Tension range : 3.0 to 8.5lb<br>Package: 1 x finger excerciser and 2 x piston locks<br><br><br>7 tension level list??meet different exercise needs. <br><br>Level 1--3 pounds<br>Level 2--4 pounds<br>Level 3---5 pounds<br>Level 4--6 pounds<br>Level 5--7 pounds<br>Level 6--8 pounds<br>Level 7--8.5pounds</br><br/>http://www.amazon.com/gp/product/B01MSOSG5CII ? Nut an