Harbinger Ergonomic Grip Strength System with Progressive Resistance Levels, Set of Three Grips

At first, there is a lot of resistance in each grip. But shortly after compressing them a few times, they get much too easy. Still fine for keeping by my desk and squeezing every now and then to maintain my grip strength. But it would be nice if they kept their same resistance.

Edit: Reducing by one star as one of the trainers has started to split open and will become useless soon...its only been 2.5 months.I never liked grip trainers until this. It even feels good in the hand, and I catch myself using it just for the feel.Hand strength improved very quickly, and you can train in all sorts of interesting directions.

Best hand work out ever

Much better quality than others I have known. Highly recommend.

Great to workout grip while driving. Soft one is easy to use, medium one is what I normally use, hard one is very challenging for more than a few reps.

Had difficulty in using them initially, but they quickly became very easy and enjoyable. Wish they came with instructions to understand the variable uses of them.

good to use and can use anywhere

This is a fantastic product. Easy to use, and effective. Great for golfers!