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Amazon.com: Faxx French Horn Rotor String, 36″ White (1 Yard) - For Replacing Your French Horn Valve String : Musical Instruments
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Faxx French Horn Rotor String, 36? White (1 Yard) - For Replacing Your – Starving Students Music Supplies
How many years do the valve strings last on a French horn if you play it, say, four hours a week? - Quora
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