Bore Ø: 14.35 mm, Pitch: 440hz and 442hz, Delivered with two barrels: 62,5 mm and 64,5 mm, System: standard Boehm N°1B (17 keys, 6 rings) with left-hand Eb lever, Barrels, body and bell in grenadilla wood, Keywork: silver-plated nickel silver, Adjustable thumb rest, Leather pads, Metal tenon sockets (male + female), Blue steel springs