Koan provides tools for manufacturing, if you want to get into the relationship with steel...
To build the notes and smooth the hull, works with a regulator (operating pressure of 2/4 bars).
410€ shipments in France included, 430€ shipments in Europe included, on request for other countries.
3 removable heads for note tuning and fine tuning.
€190 shipments to France included, €210 shipments to Europe included, on request for other countries.