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 contains 118 cc and is for who maintains on regular base multiple inline skate pairs. Who maintains only one pair infrequently, could choose this smaller bottle: Bones Speed Cream 13 cc