Not much to say this is a very good product, it is always with me casiment I did every day, about 10 sets of pressures from around 20 a month I started 20kilos, good for a bit easy right hand but enough for the left, I broke my left arm there is some time. After 15 days I increased to 30 kilos. Lol So to summarize, if you are looking to have a good grip, for fun to see the suffering in the eyes of people to whom you shook hands you've found your Grail. PS: I use it in parallel with a powerball and after a month I see the result!
