【Wide Compatibility】 Replacement Tires compatible with iRobot Roomba 500, 600, 700, 800 and 900 series models. 【Package Contents】 4 Replacement tires,1 cleaning brush,1 Small thread cutter. It is recommended that replace the Wheel Tire tread every 6 to 12 months to ensure optimum performance . 【Premium Quality】 rubber tires are made of premium silicone, Each rubber tire has been tensile tested for high strength and good friction resistance 【Easy installation】cut and remove worn rubber tires, place new tires.Because rubber tires have superior tensile properties,, snaps in place, no tools requiredp 【Effective Anti Skid】The wheel will not skid on the floor, also this will prevent irobot failures, make house cleaning more efficient and resistant to wear.