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Nice size selection.
They're simple, but work perfectly for what they do. The variety of sizes is good enough to fit anything I own and I suspect all common sizes of toys. The construction seems to be durable and is easy to clean.
You won't beat this quality at this price-point. If you want O-rings, this is your best choice.
Got these for the harness and they're better that the ones that came with it. A little heavier and firmer which should hold the tools more securely.