About the model Key of Bb, Range to Low C Silver plated nickel silver has more texture than nickel, which makes it easier to finger fast technique Aged grenadilla wood body Silver plated brass bell Bore: Upper 23.5mm, lower 23.4 mm stainless steel needle springs High quality leather pads get a perfect seal, but are soft enough to prevent slapping key noise (Privilege Mod 67 = Mod PC25)