Do you mean cartridge?

Per Sheldon:

A "sealed" bearing is one which has rubber or plastic gaskets to prevent the entry of dirt. In the bicycle industry, the term "sealed bearing" is often used colloquially to refer to a cartridge bearing. This can be confusing to a consumer who may think that a hub is a high-tech cartridge-bearing unit, when it is actually a normal cup-and-cone bearing with a plastic dust cap.

My Suzue's (among others) have "sealed" stamped on the cap, but they are cup and cone. My experience has been that properly maintained, sealed (cup n cone) bearings will last a lifetime. This is predicated on the quality of the parts of course.