Pirastro Obligato 3/4 Upright Double Bass String Set - Medium Gauge Full Upright Double Bass String Set Medium Gauge This Full Set Includes: Chromesteel-Wound Solid-Synthetic Core G String, Chromesteel-Wound Solid-Synthetic Core D String, Chromesteel-Wound Solid-Synthetic Core A String, and Chromesteel-Wound Solid-Synthetic Core E String These strings are made by hand using modern manufacturing techniques and strict quality control. Those wanting a traditional bluegrass, old school jazz and blues, or other styles that calls for that sound will enjoy the Obligatos.