Amazon.com: Entry model Japanese Koto harp, 13 strings with beautiful head cover, New, including koto bridges and practice book in Japanese. w/import shipping : Musical Instruments
Slinky Nickel Wound Electric Baritone Guitar Strings | Ernie Ball
Elixir Nano Acoustic Medium Strings, 13-56 — Arizona Music Pro
Slinky Nickel Wound Electric Baritone Guitar Strings | Ernie Ball
13-string Dresden guitar. Tunned in D minor. — Michael Thames Guitars
Amazon.com: Entry model Japanese Koto harp, 13 strings with beautiful head cover, New, including koto bridges and practice book in Japanese. w/import shipping : Musical Instruments
13-56 Jazz Medium, XL Nickel Wound Electric Guitar Strings | EJ22 | D'Addario
Amazon.com: DR Strings DDT Electric Guitar Strings (DDT-13) : Home & Kitchen
Lyre of Apollo (11 or 13 strings) – ancient Greek lyre | LUTHIEROS