Hand crafted strings made from the finest materials, pure nickel wound. Precision manufactured for 'Puretone Strings' on state-of-the-art string winding machines. The professionals choice. Set of four Finely Crafted, Precision Wound Eagle-Puretone strings with plain 1st and wound 2nd, 3rd and 4th gauged as follows:- 12, 18w, 28w, 38w for GDAE Tuning.