(THESE WILL NOT WORK ON MOTORCYCLES WITH THROTTLE BY WIRE!)The Resistance: Cage Cracker Hand Guards are designed to protect from road debris and cut the cold. When we designed our hand guards we made it a point not to cut any corners. They are 100% American made out of solid aluminum. We also made sure to throw thousands of miles down personally using and tweaking the product before we let it hit the streets . As owners and designers of the hand guards we installed dozens of prototypes and had friends install dozens more making sure that installation was easy and solid when complete.