This is a Variable Tension hand exerciser.
It can be used in several different ways to strengthen fingers, hands, wrists and forearm. It also has simulated strings to help develop and maintain finger calluses when you are away from your instrument.
The ultimate condition tool for musicians.
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PLEASE NOTE: For comfortable beginnings and attainment of these goals without injury, start on a low tension and a few rounds for the first few days. Then add only one or two rounds a day and build up. Use it wisely. Do not do more than three rounds the first day even on the XXL tension and if you feel you can only do 1 or two rounds the first day then only do that... In a month or so you can progress to the next tension.