The Rotosound RB45-5 Nickel Bass Guitar Strings (not to be mistaken as the Swing Bass Nickel) are a set of high performance, excellent sounding and long lasting nickel on steel round wound bass guitar strings that produce a bright and energetic tone. Ranging from 45 to 130 gauge the RB45-5’s provide a smooth playability and are a perfect choice for a variety of playing styles.