Stable and fulfills the purpose

The band is not smooth at the edge, can so that the Thera-Band Rub and tear to it.
Solution: Buy another favorable carabiner and hang into the loop.
The carbine has a smooth metal surface, through which the Thera-Band is conducted.
Thus, the Thera-Band can not wear out and you have a long pleasure.

Note: Important, the door anchor Always place in the closing direction of the door, otherwise can possibly accommodate the door. Or someone opens the door (under tension then comes one of the door anchor opposite).
Here's a video (another similar product), how to install and to make a door anchor.
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