This is a metal roll cage for the IJ 3D printed Jeep body made by RCMUSTDIY, found here:
 
https://youmagine.com/rcmustdiy
 
This cage bolts to the stock body, and can be customized with various options. It's made of 3/16" DOM tube and 1/8" rod. I am happy to discuss CUSTOM CAGE DESIGNS with you should you want something different, just send me a message!