I've bought probably 1000 bearings in 100-bearing units over the past 5 years, and loved them. this time I decided to go with the '1000' bearing purchase, thinking they were the same. Not quite. These are really greasy - grease everywhere, inside, outside. They come in plastic sleeves. Can't tell what they're lubed with - I'm thinking grease, although I can't see any - primarily because they don't spin like the oil lubed ones I've purchased in the past. None of my customers wanted these - I've had to fire sale them for less than I paid.