Lots of metal.... durable rubber.... solid magic arm.... Everything you need.My truck and my car are both primarily aluminum, and magnetic mounts just won't work. This K&F Concept 6" mount, however, does not rely on magnets, holds firm, and is super easy to check if it still has suction. Simply press up to the flat surface, start pressing the button to create suction, and keep pressing until the white suction line disappears. Easy peasy....The "cheese plate" mounted to the suction cup gives plenty of mounting options, however, I really like the provided magic arm. It holds firm AND has locking pins. Nice....So where does this work? Per the manual...- On on smooth, flat, non-porous surfaces.- Car speeds below 80km/h- 0 degrees Fahrenheit to 140 degrees FahrenheitI suctioned this on my smooth fridge door (not bumpy, perfectly smooth) and it kept perfect suction for over 24 hours.Where is this not to be used? Per the manual....- This is NOT recommend for skiing, surfing, rafting, or other high impact/intensity sports. Additionally, there is some felt material behind the suction cup which probably shouldn't get wet.- On paints surfaces, marble, old tile, wallpaper, rough glass or breathable materials... With that said, I suctioned this to my eggshell finish painted wall and it held well, though I didn't leave it on there long. So it will connect, but given the difference in smoothness and finishes of painted walls, I understand why it isn't recommended.I'm really pleased overall with the quality. Not planning to use this at high speeds with my car, but will be good for filming with my Canon R50.