3.40 mm - copper wound/round wire - heavy+ - Sheep gut
cello - 4-C
Copper wound / round wire, no underlayer - Sheep gut
The original, historical type of wound strings.
The wire, like the historical examples, is round and left round on the gut core so that the tops of the wire can be felt. There is no silk underlayer between the gut core and the wire. It has a bright tone. Since the speed of sound is faster in copper than it is in silver, the copper wire lends a little brightness to the tone of these strings making the copper string a good choice for an instrument that has a dark lower register, or if you just want to try a new tone on your instrument.
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