X4 Aluminum Flex Chassis works for some carpeting tracks, and high traction asphalt songs. The X4 chassis is designed to utilize the X4 suspension system hands, engine mount, T-brace and features holes for centering pins for the bulkheads, front shock tower, and rear human body mounts. The 2.0mm thick aluminum flex chassis is CNC-machined from premium Swiss 7075 T6 aluminum, then black colored coated and laser engraved. The ultra-narrow framework is just 84mm wide and features unique cut outs that offer the framework flex characteristics suitable for a wide variety of the traction amounts. The base of the framework is shaped to reduce contact between your chassis and the ground while turning to enhance cornering speed.