Thin Aluminum
Had one of these I used for five year without any problem, these will not hold up to anything over 1 pound, lifted a full beer can some one threw out their car window on my lawn and the gears dislodged, had to take it apart and repair it after just one use. Be careful if it is anything that has some weight to it. As you can see in the picture one is perfect and the other won't close all the way.
Rating: 2 stars