FULL SILICON NITRIDE BEARING(PTFE SEALS) ISO9000 FULL SILICON NITRIDE BEARING(PTFE SEALS)COLOR: BLACK COLORTYPES: 604-6024,624-6224,634-6324,684-6824,694-6924,UC SERIES ETC.QUALITY: ABEC-1~ABEC-5APPLICATION: HIGH TEMPERATURE (900 DEGREES C), HIGH HARDNESS, CORROSSION-RESISTANCE, SELF-LUBRICATION ETC.