So glad I didn't see any tips saying to "use organic polymer to craft them then place and destroy for 100% of your materials back" or any bs related to that. Anyway, this thing has 50k health, has 350 slots, will fall to the ground instead of being destroyed if the floor under it is destroyed, can stack on each other if one falls on top of another so you can theoretically create op walls with these (this was removed/patched but reverted shortly after due to some stuff that happened), and supposedly you can destroy them using 15 c4.

On old mobile it acts the exact same but costs less to craft at 300 metal, 60 polymer, 75 cementing paste and 30 oil (I totally didn't guess on the cementing paste and oil because I definitely didn't forget)