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Title: Works quickly and effectively
Review: For the first week the only result I noticed were sore fingers. After about 10-12 days, the callus development was very noticeable and consistent. Initially the soreness of my fingertips would be the limiting factor in how long I could use the Gripmaster, but now my fingertips have strengthened up enough that I'm only limited by the muscular fatigue in fingers and forearm. I use it with a light (blue) gripmaster and wouldn't recommend anything stronger to start. I think you would also see very satisfactory results using the extra-light gripmaster.
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