BSB skate bearing set ABEC-9 - Skate / inline skate bearings - Bearing core 608 - Long life - Little maintenance required - Set of 16 pieces - Ready to use, no running-in period required - Heat treated non-contact shield - Removable steel c-ring for easy cleaning and lubrication - Balls are heat treated and honed to ensure a hardness of HRC 62 to 67 and superior durability BSB ABEC-9 bearings are the top in the ABEC rating system.