This is a view showing the bases. The one on the left has a "Mold Line Across Base", and a sharp inner edge between the base and the inside of the outer skirt. The right-hand one has a smooth rounded edge continuous from the base to the inside skirt, and a sharper outer edge. Note that the base like the one on the left is often referred to as "Rounded Base" or "RB" because the outside edge is often rounded with the mold line curving around it from the outside skirt. It's not the clearest of terms though, so that's why I prefer to call it "Mold Line Across Base". In fact, the one on the left in this picture has what looks to be a fine line around the outer edge of the base as well, but not as sharp as the inner edge. Next: [id=148871817]