Let me first say that Gpm is an amazing manufacturer of rc parts! I was a little skeptical about purchasing this part simply because, well, it really doesn't do much. But, after i had almost all of the rest of my car aluminum it looked funny with these big black blocks messing up the beautiful shiny finish. So, i went ahead an bought them. To my surprise, they really do something besides looks! These are where basically everything in the front assembly connect to. If you get an imperfect one, it really screws with the alignment of your front end. To handle well, your car needs a strait front. These solve all of those issues by being well, perfect! I noticed an improvement in the way my AWD car handles. The front suspension is smoother. Before my car would bounce around because of the binding front A arms. With these they preform flawlessly. Also they straiten up the front cup shafts, reducing power robbing friction. This means your car will run faster, cooler, and longer than before. used with the switchblade chassis, gpm A arms, gpm cup shafts, gpm front Awd axles, knuckles, and ceramic bearings you will have the ultimate in front end performance! Thanks rcmart and gpm!