Product Description Ernie Ball Mondo Slinkys are ideal for players who prefer a heavier gauge with a little less tension on the plain strings (E, B, G). These electric guitar strings are precision manufactured to the highest standards and most exacting specifications to ensure consistency, optimum performance, and long life. Mondo Slinky wound strings are made from nickel-plated steel wire wrapped around a hex-shaped steel core wire while the plain strings are made of specially tempered tin-plated high-carbon steel, resulting in that iconic Slinky feel and tone that players have relied on for decades. Mondo Slinky gauges are .0105 .0135 .0175 .030 .042 .052. From the Manufacturer Mondo Slinky strings are ideal for players who prefer a heavier low end with only a slight difference in tension on the plain strings. Gauge combination: 10. 5, 13. 5, 17. 5, 30, 42, 52