Chris Potter checking out the Heidinga tenor saxophone neck 

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The traditionally hand-hammered Heidinga neck can significantly improve the resonance of a new saxophone but can also help even legendary instruments like the Selmer Mark VI or Balanced Action achieve a richer sound.
The neck, handmade by Friso Heidinga, is the product of years of testing and fine-tuning, as well as extended collaboration with some of the world’s top saxophonists.
The Heidinga neck furnishes the saxophone with a broader palette of harmonics, thereby enhancing the player’s personality and simply making playing more fun, easier and a renewed pathway to inspiration.
The Heidinga neck can be a valuable upgrade for your instrument, because ultimately you want your horn to give you the freedom to experience fully your own sound.