... have excellence performance as special electrical and magnetism resistance, wear and corrosion resistance,lubrication and maintenance free when working, especially high and low- temperature application, etc. could be used ... the cage with GFRPA66-25, PEEK,PI, Phonemic Textiles Tube ,etc.Features: 1, Material: ZrO2, Si3N4, SiC and Al2O3, etc.1).High speed ...