This is the same tin coated material used in the manufacture of guitar strings. This is not piano wire.
Dulcimer Wire 1-Pound Spool – Mapes Strings
Copper Wire Dead Soft 1 lb
Golden Age Shielded Push-Back Wire - 50 Feet
626 - 25.8 VSL Radiused - John Matthews — McCafferty Dulcimers
Timbre hi-res stock photography and images - Page 2 - Alamy
Pricing Dusty Strings
Tuba Player Marching Band Stock Photo 8754736 Shutterstock
Specialty Wire - Mapes Wire
Betsill Workshop
Buy Roslau Piano Wire (Sizes 12-21) - 1 Lb. Coils
9/8 Fledgling Hammered Dulcimer (Two Strings Per Course
pickup wire size - Cigar Box Nation