These brush heads are perfect for my Oral B Genius 8000. They're probably like medium-hard bristles, they're comfortable on my teeth, not too hard but strong enough to feel clean . Set of 4, easy to assemble. I've included a picture of the metal part of my electric toothbrush so you can compare if the heads match yours. I'd say they're very similar to Oral B's delicate toothbrush heads. Although I've only tried two of the Oral B brushes, this is my best comparison. Great for the price, worth it for me!
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