GHS BCM (11.5-56) MEDIUM BIG CORE STRINGS A slightly larger core wire for improved tone and increased sustain. The size plain steel strings help to balance the set.Introducing our brand new NitroPack singles! Each single string is sealed in a nitrogen environment, eliminating all oxygen, in a tear-resistant package. Whether you use one string or the whole set, the NitroPack guarantees straight from the factory freshness!ABOUT GHS STRINGSGHS Strings are manufactured in a state-of-the-art, climate controlled facility using precision equipment and only the purest of materials. The air-tight Fresh Pack locks in factory freshness that endures the test of time and locks out corrosion. When you buy GHS strings you get quality, consistency, lasting intonation and superbly harmonious sound! GHS Strings – The String Specialists since 1964.BCM Set: 011 1/2-015-019-RM28-RM38-RM56