Think Crucial 2 Replacements for Roomba Brush & Bristle Brush Roller Fits iRobot 500 & 600 Series, Compatible With Part # 81701 & 82301 HIGH QUALITY ROLLER BRUSHES that replaces your existing vacuum's worn out brush. Get back to running your toes through clean carpet once again.! Fits iRobot 500 & 600 Series Roomba Robotic Vacuums except for 4000 series or XL21 series. HEALTHIER LIFESTYLE! You shouldn't worry about if your carpet is really clean when you and your loved ones are walking on it. A new roller brush will dig deeper into your carpet, lifting away more dirt and muck than you thought possible. EASY TO INSTALL so you can get back to cleaning as soon as possible! Simply remove your old roller brush and install the new one. With a simple toolkit and a half-hour, you can restore life to your vacuum. SAVE MONEY by using a new roller brush! If your vacuum isn't cleaning your carpet completely, you have to vacuum more often, at the expense of time and your electric bill! Compare to iRobot Bristle Brush Part No. 81701, Beater Brush Part No. 82301. GUARANTEED SATISFACTION because of a 30 day full money back guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!