The D'Addario J4504 Pro-Arte Nylon Classical Guitar Single String is designed for players who demand the highest quality sound and performance from their instruments. This string is specifically designed as the fourth string for classical guitars, with a normal tension that provides a balance of volume and playability. Made from high-quality nylon, this string delivers a warm, rich tone with excellent projection and sustain. It's ideal for both beginners and professional players who want to achieve the classic sound of the classical guitar. Whether you're practicing at home or performing on stage, the D'Addario J4504 Pro-Arte Nylon Classical Guitar Single String is an excellent choice for enhancing the sound of your guitar.