Ernie Ball Skinny Top Beefy Bottom Slinkys combine the lighter playability of the Regular Slinky set with beefed-up wound strings for a thicker low end. These electric guitar strings are precision manufactured to the highest standards and most exacting specifications to ensure consistency, optimum performance, and long life. Skinny Top Beefy Bottom Slinky wound strings are made from nickel-plated steel wire wrapped around a hex-shaped steel core wire. The plain strings are made of specially tempered tin-plated high-carbon steel for that iconic Slinky feel and tone that players have relied on for decades. Skinny Top Beefy Bottom Slinky gauges are .010 .013 .017 .032 .044 .054.