They are very small. The concept is solid, but the heads are thin plastic and small. Some of the heads were not strong enough for the metal pin part not to pierce them. I've tried them on several feathers and anthers. The only thing they did without any problem was the mattress. And you can't attach the duster to the mattress because you have to change the sheets regularly. I think I'll grab upholstery nails and a hammer to get the job done, or a construction stapler. Or buy dustproof ruffles with elastic bands.
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