Adamas Strings for acoustic bass Nuova coated - Set 4-string med-light (5300NU-ML)Adamas Phosphor Bronze coated strings Solid brass ball end High end Premium Phosphor Bronze, coated Ultra thin nano coating below 1 micron = 0. 001 mm is applied to the winding wire and core before the string is wound. Alloy specially modified for the coating with a high copper content. Warm, rich, earthy tone Environmentally friendly packaging, strings shrink wrapped with tarnish protection With ADAMAS NUOVA sticker 5300NU ML: Set 4 string Medium