Poor quality plastic. I was doing a penalty test in normal mode and crashed into a wall 3 feet to the right and the plastic hinge connecting to the base of the motor broke, causing my Mavic Air 2 to fall. I did not test in sport mode. but I suppose not meant for that. By the way, I noticed (which is understandable and not a defect of the device, as I assumed when I bought it) that the Mavic was very unstable with the protective covers that came with it. At the time of writing, I wish the DJI Fly app had a "payload" option to let me know that the device has extra weight to potentially balance it.