Ernie Ball P01016 Plain Steel Replacement String - .016 Gauge -- SINGLE STRING Made of specially tempered tin plated high carbon steel used on electric and acoustic guitars Ball ends are made using brass wire rod which is machined and cut to exacting specifications to ensure a precise fit and function. All plain strings feature a series of lock twists to secure the wire around the ball end preventing slippage and ensuring a long lasting string within minimal break in time.