Material:AISI440C rings and rolling components with HRC 58-62; AISI304 or AISI316 cages, shields and seal ribbons; precision available is P0 and P6 with vibration Z1 or Z2 (deep groove ball bearings); rolling components: AISI440 stainless steel balls of grade 10 or Si3N4 ceramic balls of grade 5; or AISI440 rollers of grade 2; grease: Mobile HP 25%~35% filled