... certificate 5.Plenty of stock Hot Supply Ceramic Bearings 6004 6005 6006 High Quality! Features: 1, Material: ZrO2, Si3N4, SiC and ... .0006607LL71912.000660882214.0007608L82214.0007608LL82214.000760992415.0007609LL92415.0007 2012! NEW 6004 6005 6006 Ceramic Skateboard Bearing