These replacement brushes are actually 100 times better than the original brushes that came with my shark robot. The only problem is that the 2 extra brushes allow the hair to detangle between 3 if my shark wasn't so sensitive and was making mistakes all the time because of it. These brushes would be excellent because they really help pick up more dirt than the original manufacturer's version. unfortunately they are not designed for this sensitive robot. my original shark robot (4 years ago) wasn't as sensitive as the newer model (1 year ago). I believe these brushes will work much better with the old version than the new, more delicate one. Excellent performance, unfortunately the bad product can not stand even this excellent brush replacement.