Long lifetime: The transducer discs with premium material, anti-aging, anti-corrosion, can last a long to 5000hrs. Compatable with: the replacement discs diameter is 20mm, as the optimyst parts, it fit for electric heater. Application: If your optimyst fire lack of mist or stop mist, the transducer disc may help to solve the problem. Replacement transducers disc for optimyst fire If your Opti- fire had stopped misting, it possible problem as the transducer. Try to replace the transducer disc, it may help your electric fire smoke effect come back. Replacement transducer disk Great replacement part for smoke effect fire. Colour: silver Material: metal Package Contents: 6 * Transducer disks 1 * Replacement cap tool Only the above package content, other products are not included. Note: Light 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.