M bore .453 '= 11.51 mm Brass bell Ø 4 7/8 '' = 124 mm Gold brass mouthpipe Nickel silver outer slides Stainless steel valves Thumb saddle on the 1st valve train Adjustable finger ring on the 3rd valve train 2 water flaps Original VINCENT BACH 7C mouthpiece and valve oil Finish: clear coat Lightweight case with backpack