... ceramic products according customers requirements. just like Hollow ball,Hollow hemisphere,slip products,column products,Composite material pieces ... ,decollated electrode,axial polarized,shear polarized,radial polarized,single side wir,two sides symme,hole discs,rectangle piece ... 5 - 8mmd) Circular ring:i) Excircle diameter: 5.0 - 100mmii) Inner circle: dia. (2.0 - 35mm), T (0.2 - 15mm) e ...