I have been using Power Putty for about 4 months. Started with the green one and then about 2 months later the blue one. I have seen a remarkable increase in my hand strength! I am an over 60 woman who for the last couple of years found it difficult to near impossible to open jars. Now, they are no problem whatsoever. And, I can carry heavier things in my hands than before since it has helped my wrists get stronger also. I would definitely recommend this product. P.S. Never had a problem with the green one leaving color on my hands like I have read in some of the reviews.
Rating: [5 of 5 Stars!]