This hummingbird feeder is by Perky-Pet, one of the leading makers of this type of liquid feeder.  It is a big one, so make sure you are aware of just how large 30-oz is.  It is sturdy glass, and has multiple feeding stations -- more than we ever need for the number of hummers who visit us.  Just make sure you keep the glass clean, because in the summer it's easy for mold to develop.