Aurora has developed a proprietary technology for wrapping guitar strings in brilliant protective color for the best sounding, longest lasting, highest quality coated string possible. The Aurora formula delivers crisp, clear sound every time, while providing extended string life and a great new look. Packaged in solid color sets, string colors can be combined for a unique customized look. . . the possibilities are endless! If you are a younger player or have a more delicate stroke choose a lighter gauge. For a harder play choose a higher gauge of string.