brand new and high quality Material: Ceramic (20mm is the atomization film size, ceramic is atomization film material, and the exterior material is silicone and metal.) Specification: 20x1.2mm Voltage:5-12V Resonant frequency: 1.70MHz Resonant impedance: 52% Static capacitance: 1800pF Atomization quantity: < 380ml/h Quantity:1Pc Note: 20mm diameter is to remove the size of the pastic Ring On the atomization of the film 2 wires, because the batch is not the same, sometimes red and black, sometimes yellow and blue, the other does not affect the use Size for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes(no retail package): 1 x D20mm Ultrasonic Humidifier Accessories