This is an optional Schumacher Rear Roll Bar Set, and is intended for use with the Schumacher Cat K1 1/10 4wd buggy. Roll bars allow fine tuning of the suspension without making major changes to the shock and spring settings. They are used to add roll stiffness to the car without affecting the handling on bumps and jumps. Additionally, running roll bars allows you to run softer suspension on bumpy tracks, while reducing the roll in corners to help maintain stability through the turns. Package includes four roll bars, and all necessary hardware.