The Augustine Red Label Single A5 Bass String offers superb sustain and tonal projection for classical guitar performances. This string is crafted with a silver alloy copper wound bass for optimal sound. It is designed for light tension, making it a comfortable choice for players. Match this bass string with treble strings to create your ideal tension and tonal profile. The A5 bass string features a silver-plated wound design and has a diameter of .035" / 0.89 mm.