Strings are different types like Acoustic, Electric, Bass, Mandolin, Banjo. Strings are good if they are coated. And the uncoated string will quickly accumulate oils, dirt, sweat, and bits of skin that get trapped between the windings. The lack of coating also hastens the corrosion of the metal, and the feel of the dead string begins to hamper your playing performance. It totally depend upon us which string is best for make that particular type of sounds. Little bit practical on the shop and try already made strings and choose which is best.