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This is the 10x16x4mm Acer Racing Ceramic Nitride Pro Series 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 16 x 10 x 4mm bearings REQUIRES: Removing original bearings from kit tlw 8/30/07 ir/jxs