Export dural III. class
The reeds are made of Al alloy with hardness 120 HB. The channels are pressed by a precision cutting system. The surface of the reed is finely ground. The reeds are made of Swedish steel with a strength of 2000 N/mm² with a tolerance of T3, ground to an accuracy of -20 cents from the basic tone, with a head width at the rivet of 7 – 9 mm, with corrosion protection. The reeds are machine riveted with an air gap between the channel wall and the tongue of 0.05 mm on each side. The reeds are machine re-tuned +/- 5 cents.