Features Easy to train anywhere whether in the traffic jam or in the evening cozy in front of the TV High quality silica gel freezing production flexible good elasticity not easy to deformation Strengthens your finger muscles and even parts of your forearm Widely used for finger exercise when you play guitar piano bass ukulele saxophone violin or orchestral instruments Specification Material silica gelLength 7cmWidth 3 5cmHeight 1 5cmColor dark blue sky blue bluePackage Include 1 x finger trainer