Features: 1.Clockwise to increase the tension, anticlockwise to reduce the tension, meeting the needs of all age groups. 2.The detachable non-slip cushion at the end is comfortable to grip, and very helpful for the development of finger strength. 3.The finger exerciser can stretch from 8cm to 10cm, and the adjustment is very easy as well. 4.This finger strengthener allows you to practice the correct way of playing the instrument while training your fingers. 5.Light weight and compact size enable easy carrying to practice anytime and anywhere. specification:Item Type: Finger Strengthener Product Material: ABS Stretching Range: Approx. 80 ~ 100mm / 3.1 ~ 3.9in Product Size: Approx. 8.5 x 7.5cm / 3.3 x 3in PackageList:1 x Finger Strengthener NoteThe size of the product is manually measured, there is an error of 1?3 size, please refer to the actual product.