Ultrasonic piezoelectric transducer. Diameter: 50mm/1.97inch; Thickness: 2.5mm/0.1inch. Power: 35W; Resonant Impedance: 5. Radial Resonant Frequency: 435%KHz. Used for 35W ultrasonic cleaner transducer repair kit. Specification: Static Capacitance: 650020%pF Load Capacitance: 3500pF Electromechanical Coupling Coefficient: 0.53 Dielectric Loss: 0.5% Package Includes: 1 Piece Piezo Ceramic Transducer Disc Note: Color maybe slightly different due to different monitor. The above size is measured by hand, please allow slightly difference. Thanks ! Customer satisfaction is our primary concern. If the product is somehow cracked or broken during shipping, please feel free to contact us. We will try our best to give you a satisfactory solution.