Synthesis BSN-910 Double Bass strings are made with an extremely flexible and multifilament synthetic core providing the tonal warmth and feel of a gut strings while being resistant to changes in humidity.The BSN910 strings are wound with proprietary clear nylon tape formula to create an even smoother-to-the-touch string with bright and clear tone. Ideal for Slap style in Rock Rock- a-billy Bluegrass or Country & Western Swing.Instrument Double Bass ¾ - 104-106 cm / 41-41 7”Specifications:G: .085 / 2 16mm - 61 44Lbs / 27 90KgD: .100 / 2 54mm - 59 97Lbs / 27 23KgA: .125 / 3 20mm - 62 70Lbs / 28 50KgE: .144 / 3 65mm - 62 30Lbs / 28 29Kg