Review on High-Quality BBT BAMBOOST Rubber Replacement Brushes for iRobot Roomba i7 i7+ E5 E6 E7 Vacuum Cleaner - 2 Set by Darlene Thomas

Both sets had a gray part that melted, making the brush a fire hazard. I first discovered this after smelling hot/burning plastic coming out of my robot vacuum while it was running. Took everything apart to find the problem and saw that the end of the first set had melted. I hoped it was coincidence and tried the second set. This set did the same. Very creepy! I'm so glad I don't do this while I'm away from home!