There is more information needed to answer this question.
First, wich Federation you are talking about?
Second, what is your budget?... this is, how much you have and how many sets you are planing to get.
Mostly any solid plastic set on staunton design that is somewhere 3.7 inches tall should do.
check this link:
http://www.thechessstore.com/#!category/.00028-club-tournament-supplies.02-plastic-chess-sets/Plastic-Chess-Pieces
Hi,
Where to buy* quality & correct size tournament chess set?
I'm looking on amazon list but some review says that the size is small, the bottom is not flat, smell like thinner, etc.
We are planning to buy chess sets for the federation and we want chess set that is good quality. we have some very good peices that feels very solid, heavy and doesn't feel plastic.
where to buy good quality tournament chess sets?
Thank you and more power to chess.com