L bore .462" = 11.74 mm Yellow brass bell: Ø 4 13/16" (122.24 mm) 229 bell shape with lateral solder seam, 25M leadpipe One-piece hand-hammered bell Monel-pistons, two-piece valve casing brass/nickel silver Wide, shaped support pads 1st slide thumb saddle, adjustable 3rd slide rod stop Incl. 2 sets of valve guides - brass/plastic Original VINCENT BACH Symphonic mouthpiece 1½C-BB24-TH24 Deluxe wood shell case Yellow brass, silver plated finish C190SL229 Made in United States