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Guage .013 .017 .026 .035 .045 .056The SP range are associated with superior performance sound projection sonic perfection.... Well whatever you take SP to stand for what SP means to you the player is a brighter clearer and noticeably more lasting sound than standard strings. Charecteristics include greater resistance to breakage and prolonged brightness of tone. If you are looking at ways to get the best performance from your present acoustic guitar give SP 80 20 bronze strings a try; they have quite a faithful following. Oh and by the way SP literally stands for Studio/Performance...just so you know!