No info about availability.
passive strummer
Modeled after the Error Instruments Raw Spring.
https://www.errorinstruments.com/a-50804780/welcome/raw-spring-nano-noir/
A spring with a piezo contact mic.
Works well with a resonator like Rings.
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Roland TD-4$89
JVC VL-5$290.59
Boss RC-1 Loop Station
Tung-Sol 6V6-GT