Quoted from Luckydogg420:There is absolutely a difference in density
It’s not necessarily the density that’s different. There is also a size tolerance and a difference in materials (a.k.a. density).
Ball Baron gives 2.8 oz and 2.9 oz for two different balls mentioned on this page: https://ballbaron.com/product/pinball-carbon/
Density of carbon steel ranges from 4.534 to 4.544 oz/in^3
https://amesweb.info/Materials/Density_of_Steel.aspx
The volume of a sphere is 4/3*πr^3.
If the tolerance is 0.001” that means a ball on the low end of the density and size scale would weigh 4/3 *3.14159*(0.53075“^3)*4.534oz= 2.839 oz or 80.49g
On the high end I’ll leave it as an exercise for the reader.