Hey Eightballers! Love this game & have a question. Is the spinner supposed to be blank on the opposite side?

When Pinball Rescue was selling spinner decals, that's how they arranged the set. Arrow on one side, blank white on the other. However, buying from Marco & elsewhere you get two arrows per set.

Seems to me that a blank side would at least provide some strobing action when hit, whereas putting another arrow on the back might not provide much visual interest since it looks almost the same.