Features: 1.Finger exercises tension capabilities to solve the problem of the inability of guitar and piano beginner's the ring finger and the little finger. 2.Guitar beginners always can not press the button easily, this exerciser can help them to fix this problem. 3.It can training your fingers' flexibility and strength. 4.The intensity can be adjusted from 2.5pounds to 6 pounds. 5.Great finger practicing tool for guitar and piano. specification: Finger exercises tension capabilities to solve the problem of the inability of guitar and piano beginner's the ring finger and the little finger. Guitar beginners always can not press the button easily, this exerciser can help them to fix this problem. It can training your fingers' flexibility and strength. The intensity can be adjusted from 2.5pounds to 6 pounds. Great finger practicing tool for guitar and piano. s: Condition: 100% Brand New and High Quality Brand: Flanger Material: Plastic Color: Black Size: Approx. 85 x 78 x 20mm / 3.3 x 3 x 0.7inch Open Size: Approx. 105 x 75 x 20mm / 4.1 x 2.9 x 0.7inch Weight: Approx. 96g Package Included: 1 x Finger Trainer