It varies but there are a couple of different "gages" which are 15,15L,16,16L,17,17L,18,and 19.Remember the higher the number the thinner they are, and the thinner it is more spin Will be generated but it will brake quicker. Also the L after the gage means that it is in between that gage size and the size after it.
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This is a personal preference. The tighter the strings are the more control you have, and the looser the strings are the more power you have. Basically, you want somewhere in between, not too tight, but not too loose either.