The superior concert string played by the great masters! Augustine Classical Strings are designed to give you endless possibilities that will best suit your particular needs. The best way for you to decide which of our strings sets will sound best on your guitar is simple: try them and let your ears be the judge. Match one bass and one trebles set. Made in the USA. The Classic Red strings feature regular tension trebles and medium tension basses and specifically includes: · E1 - .028 inch. - 0.71mm · B2 - .032 inch. - 0.81mm · G3 - .040 inch. - 1.01mm · D4 - .0295 inch. - 0.75mm · A5 - .035 inch. - 0.89mm · E6 - .0425 inch. - 1.08mm