My wife wanted these to add small increments to dumbbells, which works for her. We've got a set of Rep hex dumbbells (with the flat shaft) and my hands are too big to fit easily inside of the dumbbell when I use them. Works fine for my wife. The cost is stupid expensive, but it's really the only incremental add on weight available that's rubber. I like that they haven't snapped after six years of use, but they do that thing where the rubber sweats and turns milky, not sure what to call it. Not a great value overall, and if we had it to do over again, I'd go with the metal Micro Gainz ones.
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