Nickel-plated cover wrap over a high tempered hexagon core. This is our most popular and widely used electric guitar set for a bright sound and good longevity. With a mixture of state of the art winding process and Stay in Tune process these are the strings that have made us famous. Packaged in the all new Moisture Barrier Packaging!!! S-1052 - HEAVY BOTTOM .010 .013 .017 .030PW .042 .052 • MFSKU S1052 • UPC 649687101077