As mentioned by other reviewers, the purchase of these brushes is avoided. Heads were rapidly dissociate from the rest of the brush which makes them dangerous. Obviously it is counterfeit. I strongly recommend the purchase of this product. I might add the email exchange I had with the seller: ME: Obviously it is counterfeit. I would like a full refund of product. Thank you to tell me what to do. ANSWER: Are you serious? Had the you-have brushes for 7 months! .... please steal money from somebody else