Originally Posted by Turbo9000

some types of bearings will come from the factory with 2 shields. Remember, these bearings are manufactured with certain specifications, and are made for a variety of mechanical devices requiring bearings to be shielded/sealed from the elements. In an application such as a model car engine, simply remove the inner seals with a sharp pick so it will have sufficient lubrication.

I dont think boca bearing manufactures their own bearings. They are just a supplier, who probably buys bearings from the big bearing manufacturers. SKF, NMB, NSK, etc.