415mm scale concert cither strings 3 different series: mountain fairy “green” with nylon core and silver-plated copper wire wound. Strong and brilliant, comfortable to play. Mountain fairy “blue” with thin steel core and nylon silk insert, wound with silver-plated copper wire. Also suitable for electromagnetic sound pickup. Very stable and brilliant. Bergfee “Red” strong steel side with little silk insert, loud and well suited for electromagnetic sound pickup.