... 32 Hybrid ceramic bearings: Si3N4 Balls,PTFE Cage,SS440 Rings; Quanlity:ISO9001:2000 Type:Open,ZZ,2RS. 63/32 Hybrid ceramic bearings : ... Very good seal. axis load reach 3kgs, 3500rpmRings and balls material: SS440,Si3N4 Retainer material: PTFE Over Z2 grade ... to electrical machines or motorsMaterial: chrome steel, Stainless steel, Ceramic(ZrO2, Si3N4), Plastic, Carbon steel, etc.Surface Special finish ...