Strings for electric guitar Ernie Ball - Mammoth Slinky. Ernie Ball nickel wound strings are made from nickel plated steel wire wrapped around tin plated hex shaped steel core wire. The plain strings are made of specially tempered tin plated high carbon steel producing a well balanced tone for your guitar. Strings designed for ultra-low tuning including Drop A, Drop B and Drop C. Mammoth Slinky features low end tone, tuning stability, excellent feel and iconic sound of Slinky Strings.