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This is a pair of 5x8mm Ceramic Nitride Pro Series Bearings / from Acer Racing. / / FEATURES: Diamond polished Ceramic Nitride Balls for low friction, low heat / build-up and smooth operation / Sealed with exclusive no contact seals for low friction and super / dirt resistance / Lightly oiled with a exclusive SIN synthetic oil in a special / process that creates an ionic bond for silky, frictionless action / New HSR bearing cage design is specifically engineered for high speed / and high stress RC racing applications / / INCLUDES: Two 5x8mm Ceramic Nitride Pro Series Ball Bearings / / REQUIRES: Installation / / SPECS: Inside Diameter: 5mm / Outside Diameter: 8mm / Thickness: 2.5mm / / kpm12/30/2006 / ir/jxs