Hand Grip Finger Trainer Strengthener Adjustable Power Training Home Fitness Equipment Exerciser Piano Guitar Finger Trainers|Hand Grips Features: 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 Exerciser Model: MFX5 Color: Orange Gender:For all people Material: High quality non-slip silicone/Plastic Strength: adjustable 3-8.5 LBS Size: 105x66x23mm Adjust 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