The Rotosound RS665LB Swing Bass Guitar Strings are a set of 4 stainless steel medium light strings designed specifically for bass guitars. With a roundwound winding and uncoated guitar string coating, these strings offer a bright, clear tone that is ideal for bass players looking for a balanced sound. The medium light gauge (35, 55, 70, 90, 120) provides the perfect combination of tension and flexibility, allowing bass players to easily navigate through various playing styles with ease. Extra durable and reliable, these Rotosound bass guitar strings are a popular choice among musicians.