various piezoelectric ceramic from beijing yongda ultrasonic,<br /><br />disc piezoelectric ceramic:<br />http://www.ydaultrasonics.com/products/disc-piezoelectric-ceramic<br /><br />ring piezoelectric ceramic:<br />http://www.ydaultrasonics.com/products/ring-piezoelectric-ceramic<br /><br />tube piezoelectric ceramic:<br />http://www.ydaultrasonics.com/products/tube-piezoelectric-ceramic<br /><br />cylinder piezoelectric ceramic:<br />http://www.ydaultrasonics.com/products/cylinder-piezoelectric-ceramic<br /><br />square/rectangular piezoelectric ceramic:<br />http://www.ydaultrasonics.com/products/square-rectangular-piezoelectric-ceramic<br /><br />ball/hemisphere piezoelectric ceramic:<br />http://www.ydaultrasonics.com/products/ball-hemisphere-piezoelectric-ceramic
