Brand new never used--dont know who made them, but it appears that they are nickle plated only. Primary tubes measure 1.895 OD, so they're probably 1.750 (1-3/4) ID. Outlets measure 2-3/4 and the reducers are 2-1/2 (pretty sure you can get bigger reducers). The reducers are adjustable and angled to point in whatever direction suits your deal. There's a couple small places where the nickle plating has peeled off--not bad. One of the reducers has a ding in it, and again, no biggie. Not the best set of headers but will certainly work. The fit ALL early Chrysler heads--331-354-392. No gaskets or hardware. $125.00 OBO + shipping from SoCal. Thanks H.A.M.B. !