DEVELOPS AND MAINTAINS THE STRENGTH AND DEXTERITY OF YOUR FINGERS, HANDS AND FOREARMS. VARIABLE TENSION PROVIDES CUSTOMIZED CONDITIONING FOR INDIVIDUAL FINGERS. VARIABLE TENSION PROVIDES CUSTOMIZED CONDITIONING FOR INDIVIDUAL FINGERS. REVERSIBLE MOLDED GRIP UNCOVERS SIMULATED STRINGS TO HELP DEVELOP AND MAINTAIN FINGER CALLUSES FOR STRING MUSICIANS. PERFECT TOOL FOR PRE-SHOW WARM-UPS AND MAINTAINING CONDITIONING WHEN AWAY FROM YOUR INSTRUMENT. THE ULTIMATE CONDITIONING TOOL FOR ALL MUSICIANS.