New XB4 Alu Chassis - Swiss 7075 T6 (3mm) Premium Swiss 7075 T6 3mm thick Super-strong Extra-stiff Increases cornering speed Increases stability CNC-machined chassis made from high-quality 3mm Swiss 7075 T6 aluminum, strategically machined in low-stress areas to make it as light as possible without affecting strength or rigidity. Designed and recommended for use at high-traction tracks without graphite front and rear top deck. The 3mm chassis increases corner speed and overall stability - a must have option part for serious racers. Optional graphite body mounts are recommended for easy body mounting. Note: Swiss 7075 T6 is an extremely rigid aluminum material. In some rare cases some small cracks may occur (for example, around openings or on edges where tension in the material is highest). Those small cracks are a natural effect and have no negative impact on the performance, reliability, or lifespan of the product, and as such are not considered to be a defect.