These are counterfeit tips. I don't understand how Revane allows this. They don't fit well on the handle and therefore make a strange noise when the brush is turned on. Because the vibration is different, the sensations are terrible, especially when brushing the upper teeth. The vibration is so strong that it makes these attachments practically useless. The feel is completely different than the actual brush heads I got with my original Sonicare purchase. Will only buy directly from Phillips in the future.
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