Swinks post "I have enquired with a US company and they claim they can make ceramic covered pin balls and also add multiple colours but the minimum runs are too much at $15 a ball but they reckon they would last 10x longer than a regular steel ball and cause less scratch damage to a playfield.
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I like your thinking. If pinball machines are worth so much . Its a small price to put in some decent balls.
Personally i have put ceramic balls in a couple of my old gottliebs. I love the way the look. Seem less prone to scratching and wear.