iRobot Roomba Dual Action Brush Replacement Parts s9 s9+ These premium genuine parts cost over 7,000 yen for a set of two. But, brushes are consumables. Just like paper bags, I thought I couldn't possibly buy them every time, so I tried various compatible products. This one picked up the most dust! I even think it might be better than the genuine product!? That's why the cost of goods was higher than other compatible products. However, as someone who also uses the s9, I wanted to help everyone reduce their running costs as much as possible, so I lowered the price to the limit. It's a high-volume, low-profit strategy. Therefore, I cannot lower the price any further. I'm sorry. There may be cheaper compatible products, but compatible products vary greatly in quality. Some of the ones I tried were slightly too large, and didn't rotate properly. I felt that the most important thing is to buy compatible products with stable quality at the lowest possible price, after trying various compatible products. I would be happy if you would consider this and make a purchase. Thank you. ■Compatible AeroBrush (Dual Action Brush) consumable parts for Roomba. *Not genuine products. They have the same performance and durability as genuine products. You can easily replace them at an affordable price. ■Compatible models: iRobot Roomba s9 / s9+ ■Replacement guideline: Replace when the brush is worn or damaged. ■Cannot be used with Roomba e5 / i3 / i7 / i7, Roomba 500/600/700/800/900 series.