Rocsai Auto Adjustable Hand Strengthener Finger Exerciser for Athletes Musicians Physical Therapy Auto adjustable tension from 3.5-8.5 lbs allows you to progressively strengthen fingers without having to buy lots of separate exercisers. Develops and maintains the strength and dexterity of your fingers, hands and forearms Highly versatile and fully auto adjustable hand exerciser and finger strengthener Challenges each finger individually using patented spring-loaded finger piston technology select different tensions for each finger and thumb ranging from extra-light (3.5lb) through to heavy (8.5lb). Greatly improves strength, speed and dexterity, improve your fretting hand strength to get richer barre chords on your acoustic steel string - or finger dexterity and reach as you glide across those electric solos. Increases precision, control and mastery for violin, clarinet, piano, keyboard, flute and more Perfect tool for pre-show warm-ups and maintaining conditioning when away from your instrument, The ultimate conditioning tool for all musicians Rebuild hand strength or ability, working alongside physical therapy, or separately, to help recovery from surgery, trauma, stroke, nerve damage as well as countering repetitive strain injury, arthritis and carpal tunnel. Exercising hand muscles, tendons and joints is vital and helps rebuild and maintain health.