Use this Dunlop DBSBN40120 Super Bright Stainless Steel Bass 5 Guitar String Set to replace the strings on a guitar. They come in a sealed package for convenience and to keep them safe. These Dunlop guitar strings are made of steel for durability and sound quality. Each package comes with sizes 40 60 80 100 and 120. Keep some on hand so if one breaks you can get back to playing quickly. This would make a nice gift for a guitar player. The package is small and easy to transport so they can be taken along when you re playing away from home.