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These are the Acer Racing Ceramic Nitride Pro Series 8 x 12mm Bearings. / / FEATURES: Assembled with diamond polished super lightweight Ceramic Nitride / Balls which do not deform under load and also insure low friction / and low heat buildup / Over 33% less bearing friction compared to conventional bearings / Exclusive no contact seals for the lowest friction and best dirt / resistance / Lightly oiled with Acer's SIN synthetic oil that creates an ionic / bond between the oil and bearing parts for silky frictionless / action / / INCLUDES: Two 8 x 12 x 3.5mm bearings / / REQUIRES: Removing original bearings from kit / / jxs 4/18/07 / ir/jxs