To prevent cables from twisting, scraping and stretching as they are pulled through conduit. Can reduce friction and improve ease of pull, helping to make pulling easier and faster. Lubricant remains present to aid removal or addition of further cables.

Wax based cable lubricant which plates out to cover both cable and conduit and remains in place over long pulls
Easy to handle, goes on uniformly without drips or runs
Will not dry out in can or conduit
Non-toxic, non-flammable, non-corrosive
Safe with most cable types (not recommended for low density PE or semi conducting jackets)
Does not wash off