Zitat:
B.1 Weight Conformity
Law 2.3.2 specifies 2.7g, but any weight between 2.67 and 2.77g is acceptable for any one ball. No more than 1 ball out of the 24 sampled may be outside this range. The sample mean must be between 2.69 and 2.76g. In carrying out statistical calculations we treat any weights less than 2.60g or greater than 2.85g as outliers.
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Quelle:
http://www.ittf.com/Committees/T3_40...003_master.pdf
Die guten Bälle sind gefühlt härter welches aber eine andere Spezifikation ist.