Hi from Italy,
I am finally picking up a Twilight Zone tomorow . Powerball is missing. I have seen that many china seller sell ceramic bearing balls. From what I see the right material, given the weight of the ball, is Zirconium dioxide ZrO2. The volume of a 1"1/16 ball is 10.29 cm3, zirconium dioxide is 6 g/cm3 so the weight of a ball of that material is 61.74g. Seems to be the same of a NOS powerball. There are also white balls made of alumina but they wheigt much less at around 30g. I'm curios to try one of these china balls because they are half the price of an official powerball. Has anyone bought one?

I received my Chinese Powerball yesterday. It's beautiful and super shiny. Material is ZrO2 and exactly 1-1/16" in size. Weight is 62 grams (62.2682g manufacturer specs). I tried a game in my road show (TZ in restoration) and it plays really well. Will see how it holds up in time but for now it looks good

IMG_20201030_182548 (resized).jpg

IMG_20201031_173120__01 (resized).jpg

No, AliExpress. Search for ZrO2 26.988 ball. Can't raccomend it for now cause I still haven't tested it fully yet