A mano professional – I. class
The reeds are made of dural Al sheet with hardness 160 HB. The channels are cut by electroerosive technology. The surface of the reed is ground. The sides of the reeds are grooved to create better wax adhesion to the reed and the headstock. 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 hand riveted to achieve a perfect connection with the reed and precise centering of the reed in the channel. The air gap between the channel wall and the reed on each side is 0.03 mm at the rivet and 0.04 mm at the tip of the reed. The underside of the channel is widened compared to the top layer. A characteristic feature of Class I is the termination of the hand riveting in a multi-faceted needle. The reeds are hand-tuned with abrasive cloth, following the basic reed profile to within +/- 5 cents.