ZIRCONIA CERAMIC BEARING(SILICON NITRIDE BALL INSIDE AND PTFE CAGE) ISO9000 ZIRCONIA CERAMIC BEARING(WITH PEEK SEALS)COLOR: WHITETYPES: 604-6024,624-6224,634-6324,684-6824,694-6924,UC SERIES ETC.QUALITY: ABEC-1~ABEC-5APPLICATION: HIGH TEMPERATURE (500 DEGREES C), HIGH HARDNESS, CORROSSION-RESISTANCE, SELF-LUBRICATION ETC.