... and balls made of full ceramic material: ZrO2, SisN4 and Sic as a standard structure, the cage made of PTFE, GFRPA66 ... from P0 to P5, made of the material ZrO2, SiN4, SiC and Al2O3, etc.Part of the model have in stock ... . Such as: 606, 607,608, 6205, 6800..... SIC Ceramic Ball Bearing 605/606/607/608/6000