This kit is legal. Usually, when you buy things from third parties, you think that you are getting the second best and not as good product as the original product. Not with that! I'm actually so impressed that it's better than OEM. The main brush has integrated rubber blades along with brushes that our original main brushes never had. In addition, the replacement side brushes feel stronger than the original OEM brushes. Plus for the price you pay you get a lot. This is the best set I've found at Revain. Will buy this again.