Made of high quality ceramic, eco-friendly and durable material, wear-resistant and corrosion-resistant, ROHS certified, for long-term use. The outer shell is made of plastic ABS with good sealing and new interior noise dampening technology to reduce vibration generated by the machine. It can be placed on any place for quiet operation. The rotor of the product is made of ceramic, the smooth surface and the detachable design make it easier to clean, ensure longer durability. Suitable for Aquarium water pump, air conditioning water pump, carving machines water pump, crafts water pump, garden fountains, and other relevant aquatic product accessories.< /p> Easy to use and replace, simply remove the filter head, open the bayonet lock of the rotor cover, take out the defective rotor with axle and bearings and replace it with a spare rotor with new bearings. Note: The data is manual measurement, please allow 1-46cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind shall prevail.