The JTR 700 is the newest Trumept model from Jupiter. A 0.460"(11.68 mm) bore, 4.8" (123 mm) bell, Rose Brass mouthpipe, tuning slide bow, Monel pistons with Delrin valve guides, Nickel silver outer slide, Adjustable 1st valve slide saddle & 3rd valve slide ring and a clear lacquered finish.