These high clearance lower rods are built from 7075-T6 aluminum and feature over an inch of ground clearance. This is aircraft grade aluminum and pretty much the strongest aluminum option for our sport. The ends house FK uniballs, the same series joints that the trophy trucks are running, there is nothing better.  Gain over an inch of ground clearance and incredible strength. 
Our business and products are based around using American products and material, we don't source cheaper parts or materials from overseas or anything like that.
Here are some basic strength differences between 6061 and 7075 aluminum and how much stronger our lower radius rods are being made from 7075.
6061 Properties
Tensile Strength – 45,000 psi
Yield Point – 40,000 psi
Brinell Hardness – 95
Elongation at Break – 12%
Shear Strength – 31,000 psi
Strength to Weight Ratio: 115 kN-m/kg
7075 Properties
Tensile Strength – 83,000 psi
Yield Point – 74,000 psi
Brinell Hardness – 150
Elongation at Break – 10%
Shear Strength – 48,000 psi
Strength to Weight Ratio: 196 kN-m/kg
Priced per pair over lower links ONLY