Hand Grip Finger Trainer Strengthener Adjustable Power Training Home Fitness Equipment Exerciser Piano Guitar Finger Trainers|Hand GripsFeatures:Small and exquisite, lightweight and portable, easy to carry.You can safely practice your finger resistance, tension and flexibility.Can help improve finger speed and sensitivity.5 pressing keys to practice finger-interval.Precise design for spring structure with copper nut and screw.Visible physical force adjustment, you can see the change while practice.Intensify your practice for specific finger with exclusive "key-hold" feature.Widely used for finger exercise when you play guitar, piano, bass, ukulele, saxophone, violin or orchestral instruments.Description:Type: Finger ExerciserModel: MFX5Color: OrangeGender:For all peopleMaterial: High quality non-slip silicone/PlasticStrength: adjustable 3-8.5 LBSSize: 105x66x23mmAdjust ment strength of pure copper inner core (increase the strength clockwise, decrease the strength counterclockwise).Notes:Please allow 0.5-1 inch error due to manual measurement.Package Included:1 x Finger Tension Trainer