purchase two of these to use while walking\/running on my treadmill . want to work out my arm at the same time I do cardio . Thought it would be a good way to burn more calorie and firm up my arm a bit at the same time . I have no problem grip they due the neoprene coating so they stay in my hand nice and tight , even when you sweat ! I have drop they to the floor several time and the neoprene do not come off so the quality be top notch . they be small and easy to store so they do not take up much space -lrb- I put mine in the cup holder on my treadmill -rrb- . I recommend this product to all .