Monel flat wire wound, deep, solid sound. Rotosound strings for electric bass JAZZ 77 MONEL FLATWOUND 4-str. RS77S FLATW SHORT SCALEStandard 40-90. Developed in 1966, Monel Flatwound strings are ideal for a deep, warm, rich and classic bass sound. The premium alloy Monel has tonal and haptic advantages over the flat wire strings of other manufacturers. Consisting of about 2/3 nickel, 1/3 copper and 2% iron, the strings have a high tensile strength and are resistant to corrosion, salt and acids. Made in the UK.