Cleartone Electric Nickel Plated Steel All Cleartone Electric strings are MADE IN USA at our Bountiful Utah factory using only the finest US-sourced nickel plated steel around a high-carbon hex core. We wind our strings under super high tensions using proprietary winding methods and core-to-wrap ratios which creates a denser, better sounding string with enhanced tuning stability. Lastly, we add our multi-patented award winning treatment which is scientifically proven to increase your guitar's volume and sustain by up to 36% & 48% respectively. Manufactured using only the highest quality nickel-plated steel wrapped around a high-carbon hexagonal steel core, our patented Cleartone treatment gives you bright, electrifying tones that won't dull with time. Combined with better tuning consistency, increased output, and the longest lifespan of any string out there, what's not to like?