Sturdy solid metal with real wood gate.  Just be sure to measure your hallway and pay close attention to the width tolerances. You can use it with one or both extensions. You can also by shorter extensions separately.  The handle locking device is very well made and easy to use once you get comfortable the thumb-and lift technique.  Looks very nice in our home and we have received many complements from friends and family as to how it blends in with our décor.