This set is built in Cortez Colorado using only USA Made wire. The shiny round plain strings and hex-shaped cores for the wound strings are tin-plated, high-carbon #A-228 music spring wire. The winding on the wound strings is nickel-plated steel wire which has become the most popular electric guitar string alloy since the late 1960’s. You will enjoy balanced tone with a superb blend of highs, mids and lows and the easy bending yet solid feel of the 10-13-17P-26w-36-46 gauging which is also the world’s most popular gauging. String tension for this set in pounds when installed on a 25.5 inch scale guitar and tuned to standard pitch is (10)15.98, (13)15.18, (17)16.58, (26)18.42, (36)19.67, (46)17.41 for a total of 103.24 pounds. All strings are 43 inches long.