I didn't even know the material, but I have to say that I understood why it is so expensive. It is of very good quality, honestly, I understood why a hinge costs so much. It is normally for windows, but I put it on a room door and simply dug the frame a little as much as it needed with a straight screwdriver and a hammer. I highly recommend it, whether for a window or a door. I didn't know that you had to buy a left or right hinge, so I sent him a photo and everything was fine. I hope this helps. P.S. Generally, if you are clueless like me, it's good to measure the dimensions with a tape measure before buying a hinge, like I did.