Thanks for the link.....interesting explanation.
"These Balls Are Lighter Than The Cellulose Equivalent And Have Superb Coloring And A More Translucent Appearance, 5.6 ozs compared to 6.0 ozs from Aramiths, and they are a tad smaller, 57mm, compared to 57.15mm. This made them play a little different."
WPA rules specify that the pool ball can vary in size from the standard of 2 1/4" up to .005" or .127mm and the weight variation can be as much as a 1/2 ounce ( 5 1/2 ozs - 6 ozs.) . There were other differences noted in the description but overall, it sounds like this might be the golden fleece for pool ball brands.......just sayin'.
Matt B.