50x17x6.5mm PZT-8 Piezoelectric Ceramic Ring For 20khz 15khz 2600W Ultrasonic Welder Transducer Add to Inquiry 50x17x6.5mm PZT-8 Piezoelectric Ceramic Ring For 20khz 15khz 2600W Ultrasonic Welder Transducer Add to Inquiry