ERNIE BALL SIX PACK OF CUSTOM GAUGE 11-1011 - .011 Plain Steel Custom Bundled by Dad&rsquo;s Diggings, LLC Custom package of SIX strings saves on shipping charges versus six individual strings and six shipping charges! ERNIE BALL 1011 (P01011) STRINGS-- SIX STRINGS Made of specially tempered tin plated high carbon steel used on electric and acoustic guitars. Ernie Ball revolutionized the market by offering Custom-Gauge single string options allowing guitarists to create personalized string sets.