ARB metal mouthpieces are designed after the original Arnold Brilhart "Level Air" pieces of the 60's. They have a very small bit area and drop off baffle which give them good edge and projection and bright sound.
Cap and ligature are included.
These are difficult to get, but worth the money if you need to "cut through" the band you are playing with.
(Special order item and normal turn around time for one of these is 6 to 8 weeks from the manufacturer.)