The brand Bones is like the Holy Grail in bearings. This Speed Cream to lubricate the bearings is what you are looking for.
Use two drops per bearings for bearings with steel balls.
Use only one drop per bearing for bearings with ceramic balls.
This Bones Speed Cream is a small bottle, which contains 13 cc. If you maintain multiple pairs of inline skates on a regular base, you could choose a larger bottle: Bones Speed Cream 118 cc