Features: Made of high quality ceramic, it is solid, durable and anti-aging, with a long service life. It features high frequency that provides fine mist, ensuring high working efficiency. Its diameter is 20mm, making it easy to install and replace. Great tool for humidifiers. Mist maker disc only; other accessories shown in the picture are not included. Specification: Material: Ceramic, Metal (20mm is the atomization film size; ceramic is the atomization film material, and the exterior material is silicone and metal) Dia.: app. 2cm / 0.79in Optional nominal frequency: 113/108 KHz Adjust the frequency difference: 0.003 MHz Temperature frequency difference: 0.003 MHz Total frequency difference: 0.003 MHz Load capacitance: 3200pF Load resonance resistance: 60 Excitation level: 0.5mW Reference temperature: 26/78.8 Insertion loss: 3 dB Stopband attenuation: 2dB Input impedance: 0.2k Output impedance: 0.2k Color: White Quantity: 1 Pc Note: No retail package. Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before ordering. Due to differences between monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Mist Maker Ceramic Disc