There are at least three types of winding techniques used for strings: round wound strings, half round wound strings and flat wound strings. The difference is in the profile of the cover wire.

Round wound strings are made with a round section cover wire wrapped around the core. They provide the brightest tone.

On Half round wound strings, half of the external core section is removed using a particular milling machine, resulting in a flatter surface. The tone is halfway between round wound and flat wound. Not so bright but not dark either.

Flat wound strings are wound with a flat wire instead of the usual round wire over the core. The sound is mellow and dark, the touch is the smoothest of the three types.

Half round wound bass strings
A half round wound string.

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