G10 Zirconia Ceramic Balls ZrO2 Ceramic Bearing Ball Dia 1.5/1.588 /2 /2.381 /2.5/2.778/3/ 3.175/3.5m/3.969/4/4.5/4.763/5 - 16mm
https://www.vogueparade.com/shopping/EN/42/1/1005003395825145/g10-zirconia-ceramic-balls-zro2-ceramic-bearing-ball-dia-151588-2-2381-2527783-317535m396944547635-16mm//