These tools are the greatest thing since potato chips. Each & every one of the 5 tools you get in the handy little drawstring bag is engineered to maximize your hand & forearm workout to a "T". They're durable & the instruction videos guide you towards doubling your strength in no time at all. I went overboard the day I received them and my hands & arms paid for it the next day.
Take your time and be diligent & you won't be sorry. Besides that, they come with a Lifetime Warranty. This set is truly the best of all worlds.
If a stronger grip& more defined forearms are your goals, you need to buy these yesterday.