I've lifted several stock guards before and these ones were light! When I picked them up I was actually very surprised. I'll try to get the name and a weight.
The guy who had them was getting them in for a customer, they were also ultra cheap... (~15000yen) Basically a very light weight guard with a mild flare on the wheel arch for a bit more wheel clearance (similar to what you can get from someone skilled with a big hammer and some high fill).