I have round wound strings and i know what flatwound strings are but can some one explain to what half wound and hex wound are and if there are other types
Half wound are roundwounds that have taken a shave to get a smoother surface. They're also called groundwound. There's no such thing as hex-wound. Hex core, on the other hand, refers to the profile of the core wire, which is, unremarkably, hex-shaped. Typically provides a stiffer string, though other benefits are subjective.
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