I bought it on January 23rd and used the first brush in February. The third needs to be replaced. This is less than 6 months even from the date of my purchase. I notice that after a few weeks they started to crumble. This has never happened before, so I either got a bad batch or they don't appear to be genuine. If we can't trust Revane, we'll have to go somewhere else. This isn't the first time I've questioned a product.
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