Features: Sensitivity: Exercise finger sensitivity, all-round exercise your finger strength and finger sensitivity. Comfortable fit: The hand size is right, fit the hand, more natural custom strength. Flexible:The keys are flexible and free, each key is flexible and free, not loose, durable. Material selection: Steel spring, elastic durable, the whole ABS material, long service life. Silicone pad: There are silicone pads on the top and bottom, good grip, smooth does not hurt the hand, non-slip more durable. Fully closed integrated design:Fully closed fuselage, no dead Angle, compact structure, no exposed spring, safe, reliable and durable. Specifications: Material:ABS Color:Red,black Size(about):9*7*2.5cm/3.5*2.8*1inch(L*W*H) Package Included: 1pc x Guitar Finger Trainer Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.