Pow Stress Ring Ball
This Grip Trainer is an extremely effective finger-hand-forearm strength and endurance trainer. It comes in 3 different levels of difficulty. is very portable and easy to use,
almost anywhere/anytime - at your desk, stuck in traffic, walking, on the treadmill, etc. Try 3 sets of 10-60 reps a couple times a week for best results over time. Its also great for stress relief.