Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: What material is the unit made of?  Plastic, aluminum?  I bought a similarly designed unit from another company but the arms/jaws ended up breaking.
Document: I have an iPad Air as well as an iPad mini and I love the cameras in them. However, trying to take decent shots while holding them still is a challenge. I was looking for a quick and easy way to use a tri-pod to hold the iPads and I found this unit. So, I decided to give it a try. Here is what I liked:1.
I bought this to help me record my son's basketball games and it works great using my tablet and it did the job. The price was great. I already had the tripod and it fit great.
This unit works on the iPad mini (only when you clamp it on the top and bottom (vertical orientation) because the unit does not compress small enough to hold it in the horizontal plane.3. This unit works on the iPad Air.Here is what I did not like as much:1. The thread mount is a standard camera thread but the mount lacks the locking pin hole that keeps the unit from rotating on the tri-pod mount.
I use this to video select volleyball games. I've used this for 9 months. Well made, with super good hold on your iPad mini. No negatives to report. Great job engineering this mount. Soft rubber edges to protect your iPad mini. Very sturdy grip. I'd buy it again.
I hate ordering things sight unseen on the internet. I ordered this with very low expatiation's, I have been pleasantly surprised. The plastic is thick the spring is strong enough that I expect it to hold my tablet securely. I would even say it could be just a little over kill, it should last longer than I will. I highly recommenced
My son bought this so he could use a tripod to make stop motion Lego Videos with his iPad.He has been very happy with it and it is easy to set up and use.
This is easily fixed by drilling a small hole in the back to fit the locking pin, but the manufacturer should have done this in the first place.2. This unit has a nice clamp on two sides, but nothing but friction keeps the iPad in place if you rotate the orientation to change from one orientation to the other. A small elastic retainer would have been nice that was adjustable. If you are careful, the unit does stay in place, it just makes me nervous doing that.3.
This is just what I needed to take candid shots I love the light weight and ease of use.Love it!
It only allows mounting from the back of the iPad. I needed it to mount from the bottom. The description was unclear. It would be good if all you need is to mount from the back.
It's a pretty decent mount for the price. I use it to mount a Nexus 7 tablet to my DSLR.Make note that this includes the tablet holder only, so you are going to need a friction arm or something to actually attach it to your tripod or stand. Make sure you get a decent arm or else its going to keep flopping over.
Answer: I think the model I have is plastic parts.   I have had no problems with it as yet ( a few months ).