These are little bespoke hand machined pieces of art, and really not intended for mass sales, I think the initial (and possibly final) run is 7 pieces.
There is a interview with Zach Vex on the Fretboard journal site (2 parts) and during part of it he goes over the creation and ideas behind this thing. A more relate-able item for the common man is the new "deaf" mic he is working on, could be a really cool tool. Podcast 163: Zack Vex of Z.Vex Effects, Part Two | Fretboard Journal
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