Features: PP hard wire: widely used in conventional hard ground, ordinary soft ground, PA soft wire: It has good toughness, wear resistance and strong resilience. It is mainly used for carpet cleaning! Product replacement: Generally, the clockwise is the upper brush plate, and the counterclockwise is the removal of the brush disk. The key is to find the correct direction of the IE. First, align the buckle on the scrubbing brush plate, and then turn it in the correct direction and tighten it. When the brush has 1CM--2CM, please pay attention to replace the brush!!