Ernie Ball Skinny Top Heavy Bottom. The Ernie Ball Skinny Top Heavy Bottom electric guitar strings are a mix of light-medium plain strings, for bending notes, and heavier wound strings. Perfect for guitarists that like to drop tune, particularly drop D. A very popular string used by power pop and heavy rock musicians. Great for power chords. Made with precision for ultimate balance, long life and performance. The wound Ernie Ball Slinky strings are made with nickel-plated steel, wound around a hex-shaped steel core, while the plain strings are a tempered tin-plated high carbon steel. Ernie Ball Hybrid Slinky gauge: 10, 13, 17, 30, 42, 52.