143C is regular guitar tuning, but one octave lower (low E tuning).
Aquila states no tuning peg holes need to be drilled.
These special sets also offered in Low A, High A and High G tuning all designed for a guitar of 64-66 cm scale can give a guitar quartet,
all using normal 6 string classical guitars, the range of an orchestra.
Silver-plated copper wound on New Nylgut multi-filament core.
DO NOT USE THESE SET ON TERZINA GUITARS