Yamaha : Flugelhorns | Buy your YFH-631GS Professional Silver Plated Bb Flugelhorn at Samash.com. We offer financing options! Yamaha made the YFH-631GS to meet the needs of the professional player! Hand-lapped pistons and slides ensures an absolutely perfect fit and seal between the pistons and casing or slide parts. Such a perfect fit helps achieve smooth air flow and smooth action and improve the response and intonation of the instrument. Monel pistons are resistant to corrosion and are an ide