SOLID is the best description. The ECA is kind of the best of both worlds. It's what we call a reverse stack reed. We have a .003 thick reed on the bottom that your tongue rests against and then we back it with a thicker .004 combined making it a .007 medium to heavyweight reed that runs with the ease of the lighter reeds. Takes minimal air and tongue pressure but holds up to whatever you throw at it with pressure and air volume. It's the brainchild of Mike over at Elk Call Academy that wanted a reed that his student beginner callers can run and the pro callers can still hammer bugles out on.