Features Resin upper joint / grenadilla lower joint. Full conservatory key system. Includes: case / care products Description Product Description Fox Model 510 English Horn Description Select Grenadilla lower joint and bell. High quality plastic resin upper joint. Metal lined tenon sockets and silver plated posts, bands, and bell ring. Stainless steel arbors and wire springs. Nickel silver keys with 18% nickel silver hinge tubing and heavy silver plating. Full conservatory system plus third octave key and low B vent key. Cork pads on low C and above. Teflon tipped stainless steel adjusting screws. Each instrument comes with two standard Fox Model XL English horn bocals (numbers 2 & 3). Accessories include a French-style double case, reed and reed case, screwdriver, silk swab and cork grease.