GHS Strings BCCL Big Core Nickel Rockers, Pure Nickel Electric Guitar Strings, Custom Light (.009 1/2-.048) Model: BCCL Featuring the air-tight Fresh Pack & NitroPack singles, guaranteed fresh from the factory! Roundwound Pure Nickel on a Hex Core Slightly larger core wire for improved tone and increased sustain. Custom Light Gauge: 009 1/2-011 1/2-016-028-038-048