Review on 2 Sets of Mountain God Replacement Roller Brushes - Main Brush Kit Accessories Compatible with iRobot 🏔️ Roomba i7 i7+ i7 Plus E5 E6 E7 Vacuum Cleaner - Replenishment Brush Cleaning Parts for Enhanced Performance by Stephanie Burgos

Bought these as an 'add-on' to my iRobot brushes, not knowing they weren't original iRobot rollers. Plugged in for the first time and the old robot Iris howls. They are too big and make a loud grinding noise when the rollers rub against each other. I'll send them back if Revane allows. Anyway, I don't think the dog will ever forgive me for that.