One of the original Fox Professional English horns, the Fox Model 520 is the plastic, most durable version of the professional instrument developed in conjunction with Grover Schiltz of the Chicago Symphony. The Fox Professional English horns are known for their superb intonation, ease of playing, and mechanical stability. High-quality plastic resin body, silver-plated posts, bands and bell ring, stainless steel arbors and wire springs, silver-plated keys, Teflon-tipped stainless steel adjusting screws, high-quality cork pads on low C and above, high-quality bladder pad on low B keyKeywork: Full conservatory key system handmade in the United States. Third octave key, split plate half hole, B tab, Ab-Bb trill key with A height adjustment, G#-A trill key, F# key tab, left hand F key, F resonance mechanism, assembly key with C-D and B-C# trills, split D ring mechanism, low C-C# trill key, articulated C# mechanism, low B with vent key, thumb rest with ringComes with hand-made French style professional case, lined case cover, three-reed case with Fox reed, silk swab, cork grease, grenadilla tenon cork caps, screwdriver, two XL bocals: Lengths 2 & 3 ~ Options: XL or XP styles: Lengths 1, 2 and 3