To further clarify, the regular lift strut fairings are a split snap-on plastic fairing that fits over the standard round steel lift struts. They are fairly cheap and do a marvelous job of reducing drag; however, they are somewhat heavy-about 12 lbs I believe. The 4130 streamline lift struts are 4130 steel shaped as an airfoil. I'm sure they would do just as much good as the plastic fairings for reducing drag, and they would be simple and quick to install and I assume save some weight. The downside is they are very expensive.