Just to follow up on my last post.Some of the harder strings are made with polyester or kevlar (used in bullit proof vests).When using luxilon they recommend that you string 10% less tight then usual.Many european players use luxilon because they play more on clay which is harder on strings and stringing rackets in europe costs more than in the US generally speaking.Here in Switzerland it costs between $45-$60 regardless of which string you choose.For the juniors that I teach they usually buy a stringing machine when they start breaking strings every 5-10 hours.Luxilon costs about $12-$14 dollars before labor and you can find other strings that are really good which are not hard for $5.I personally use gamma synthetic gut which costs about $5 per racket if you buy a reel ($75).When I string for my juniors I use Iso-speed which lasts a little longer than the gamma.In the old days they made the strings thicker to last longer and now the strings are thinner but really durrable.Personnally I perferred the old way because atleast you knew what you were dealing with.JMO
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