Specifications Hign-concerned Chemical:None Vacuum Part Type:BRUSHES Model Number:For iRobot E/i/j i3 i3+ i4 i4+ i6 i6+ i7 i7+ i8 i8+ j7 j7+ E5 E6 E7 Type:Vacuum Cleaner Parts Model Robot Roomba i, Eor j series E5 (E5134) E6 (E6198) E7 i7(7150) i7+ i7 plus(7550) i2 (2152) i3(3150) i3+(3550) i4+(4552) i6+(6550) i8+(8550) j7+ (7550). Feature: 1.Brand new, high-quality materials, well-made, durable, and highly matched with the equipment. 2.Uniquely designed brushes with rubber treads to adapt to different floor surfaces that remove everything from small dust to large deposits. 3.The powerful cleaning function makes household cleaning more time-saving and labor-saving. It is suitable for a variety of floors such as ceramic tiles, marble, and wood floors. 4.In order to achieve the best cleaning and filtering effect, cleaning accessories should be replaced every 2-3 months according to the frequency of use.