WHICH BALL IS LEGAL ? (Now that 40mm is approved for ITTF use)
This depends on the tournament or club involved.
For International events, the ITTF has mandated use of the newer 40mm ball.
BUT... In the USA, the USATT has allowed local choice.
This means that in the USA you can use which ever ball you
and your playing partner(s) prefer EXCEPT for tournaments or leagues where the
decision is up to the organizers - who will (hopefully) follow local preferences.
--- Both balls are widely available from local or national suppliers.
At some clubs almost no-one has switched, at others nearly all have - usually
this depends on whether nearby tournaments are using 38mm or have switched to 40.
--- In Connecticut, more players in SW Connecticut are using 40mm, because some
of them attend monthly tournaments in New Jersey where Barry Dattel & Lilly Yip
have chosen 40mm.
--- But in Central and Northern Connecticut many are still using 38mm as are some
of the tournaments in the nearby Boston area.
--- The most common comment heard from those who've switched to 40mm seems to be
"It (40mm) isn't 'that bad' " though a few older players or those with vision
problems have stated a more enthusiastic acceptance of the slightly larger and