Part # 2862. ARB Features. ARB designs an extensive range of Old Man Emu coil springs for each vehicle, using state of the art micro-alloyed spring steel to ensure superior resistance to sagging and corrosion.
Seems to be a well made/manufactured product. No issue or concerns with quality of the springs whatsoever. I used the springs to replace the factory air springs on my 2006 2WD Toyota Sequoia. These springs did add a bit more lift that the stock air bags. I would guess as much as 4-5 inches and I used only a 1/4" thick piece of hard rubber between the top of the spring and the coil seat/cup on the body that they fit in. Anyone doing the same and not wanting much lift over factory might want to look for a spring about 2 inches shorter with the same weight capacity rating.
Overall, I would say with the springs and new shocks the vehicle rides as good or better than new.