I recently made 25 sets of the clear plastic's for Bally Fireball. I have sold about 15 of the sets and put one set in my Fireball. Two of the plastic's take direct hit from the pinball. One on either side of the messenger ball. I was told the best material to use by the people who cut the plastic's was PETG. So far my plastic set is holding up without a problem and I have had only positive comments from everyone who has installed the plastic's. I will probably make clear plastic's for other EM games in the future and will most likely use PETG again.