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Gali Italian company recently made oud strings with three versions: normal nylon version, crystal version, and the third version black nylon. The type available with us is the regular nylon version, Duzan Fafa 12, and nylon string. The medium tension. The weight from bottom to top (from the string of the answer to the decision). Fa - nylon. Do - nylon. Sol - nylon. Re - metal. La - metal. Fa - metal.