Acer Racing ARZN004

This is the Acer Racing Ceramic Nitride Pro Series Bearing Kit for the Mugen MRX4R and MRX4X Kits. 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 Eight 21 x 12 x 4mm bearings Four 18 x 12 x 4mm bearings Four 13 x 6 x 5mm bearings Two 10 x 15 x 4mm flanged bearings Two 10 x 5 x 4mm flanged bearings Two 5 x 10mm bearings Four 10 x 6 x 3mm bearings Removing original bearings from kit tlw 8/30/07 ir/jxs