[Compatibility]: 2Pcs 4 1/2inch universal ceramic ozone plates are designed for replacing the old ozone plates in ozone generators and compatible with different air purifiers & ozone generators which use 4 1/2inch ozone plates[Wide Application]: perfect for helping the generator to remove odor , office, factory, food industry, etc[High Performance & Durable]: ozone output up to 3500mg/h for deodorizing and making the air in your space. Features long lifespan of 8000 hours for supporting long time working, no need to change frequently[Easy to Install & Maintain]: Simply insert the ozone plate into the air purifier before operating the purifier, can be removed easily and cleaned with water, just scrub with brush and then rinse & dry[Plate Overall Dimension(LxW)]: 4 1/2inch x 4 1/2inch (11.43 x 11.43 cm)size: 11.43 x 11.43 cmMaterial: pottery and porcelaincolour: whitePackage Contents: 2 x Ozone sheetOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.