Dynasphere actually tells you its size and weight specifications. Aramit does not publish this information either. Definitely not the cheaper brands. And it's not just talk. The silver Dynasphere balls I received were ALL 57.2mm in diameter with a 2.25" point. According to my digital caliper no deviation! Also the weight tolerance seems to be advertised as less than +/- 1 gram. I used a fairly cheap digital kitchen scale so I'm reluctant to assume I have exact numbers, but for me all the balls were around 168.5g (+/-) 0.9g. Before I bought this set I bought a $55 poly ball set looked very nice but the weight varied plus or minus 5 grams! And most balls were just over the 6 ounce max. Also, the diameter varied from 2.22 to 2.27 inches. Of course in a completely different quality. To be honest I thought these poly balls were great for a crappy player like me but I returned them anyway. So this set is tournament quality and the balls are nice too. Of course, they cost a little more than these polyamide balls, but Dynasphere makes cheaper balls that have to meet the same tight tolerances. I know my bad shots can't be blamed on my billiard balls. I am very satisfied with this set.
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