... Our company has over 30 years of experience in the design, development, test, and production, of piezoelectric element and ultra Product ... company has over 30 years of experience in the design, development, test, and production, of piezoelectric element and ultrasonic transducer ... standard and custom ceramic elements. Piezoelectric ceramics ring made of PZT-4 or PZT8 are used widely for ultrasonic ...