Since 1964, GHS Strings has grown from a small family-operated business to one of the leading companies in the market. Their dedication to string technology and innovation has earned them the respect of the world's most famous artists, many of whom closely collaborate with them on their Signature Series of strings and endorse their products. They manufacture strings for many different fretted instruments including acoustic, electric and classical guitars; electric bass; mandolin; banjo; pedal and steel guitar. One of their key innovations is their "Brightness Bar," found on certain packages, which shows the type of tone those strings will produce.GHS Boomers guitar strings are the company standard and one of the most popular brands of strings used by professional musicians in all genres of music. They're constructed of a round core wire wrapped with nickel-plated steel. This design produces a bright, long lasting tone. Their phosphor bronze acoustic strings are made with copper, tin and phosphor over a hex core (as opposed to a round core). This increases the string's tonal brightness and makes them more flexible. Their famous Signature Series strings are designed in collaboration with some of the music world's top names, including David Gilmour, Flea, Eric Johnson, Muriel Anderson, Doyle Dyke and Laurence Juber. Other string varieties include Nickel Roundwound, Vintage Bronze Acoustic, Silk and Steel, Progressives made from filament grade alloy and Bobby Osborne mandolin strings.