The Pirastro Flexocor Deluxe Double Bass D String has a comfortable long lasting feel for the developed musician. The core is made from steel to produce a clear tone with balanced decay. This model has a chrome steel winding for a consistent feel that is resistant to wearing from dirt and grit. This strings medium gauage is a balance between comfort and low end resonance. This model has a ball end and is designed for 3/4 size double basses.The Flexocor Deluxe strings offer versatile playability and unmatched comfort. The strings have a rope core made from high quality carbon steel which is both flexible and has a loud projection. Because the steel is reactive to subtle nuances in your playing the Deluxe strings achieve a wide range of tonal possibilities. Each string is chrome wound for maintaining a consistently comfortable feel. The medium gauge tension has the optimum balance between versatility and feel. This string model is ideal for advanced players who want their own style to be resembled with clarity and precision.