Kessler Custom Heavy-Mass Bass Clarinet Neck

Compatible with second gen Kessler bass clarinets only (it will not work on other similar bass clarinets from other nameplates), this neck's added mass and heavy plating stiffens the metal, and more efficiently transfers the vibrating air from the mouthpiece to the body of the instrument. While this may sound like snake-oil, it isn't; you want the neck of your bass clarinet to be super-stiff, and not self-resonate.

Think of this like heating your house—you want to insulate it from the heat leaking outside. This is the same thing with vibrating air: if the neck vibrates, you lose energy before the air hits the body of the instrument...which is what you WANT vibrating.