This flexible chassis has been significantly modified from the jig-built flexible chassis. The specifications are as follows: Bridging Construction "The front and rear units are connected with aftermarket straight carbon fiber that has been split, increasing the strength of the center chassis and preventing cracks." Underside Raised with Liner "When using 23mm tires, the bottom of the chassis will hit the ground upon landing, so raising the chassis bottom is essential. A liner is inserted to raise the bottom by about 1mm, and then polished." Battery Coverless "The battery is held in place with a rubber liner for weight reduction." Damping Rubber "It provides strong damping to keep jumps low and landings smooth. The black spring has been pre-cut by one coil, which is essential for 3D courses." Aftermarket Carbon Fiber Stay "The chassis shaft has been cut, and aluminum shafts with black countersunk screws are used. Carbon fiber provides stable support to prevent drooping." Axle Hole Reamer Treatment "There are individual differences in the axle holes, and some holes may not fit 620 bearings, so they have been expanded with a 6mm reamer." Spur Gear Clearance Processing "The gear covers have been shaved to prevent the spur gear from contacting them." Front and Rear Bumpers Raised 1.5mm with Reinforcement "Raising the bottom is essential for bank through when attaching brake stays. Also, because the base becomes weaker by raising it, carbon fiber reinforcement is applied from the inside and reinforced with black instant glue on both the front and rear." Bumper Cut "The post-processing after cutting the bumper has not been touched. It is recommended to adjust it when installing AT or anchor systems." Normal Terminal Voltage Adjusted "If the normal terminals are well-polished, they will have good electrical conductivity and can be used longer than gold terminals, which get scratched easily. Each voltage has also been increased with brakes." Normal Gear Cover Screw Fastening "The normal gear covers often come loose, so they have been fastened with screws. Also, it supports the motor and prevents voltage leakage. This is also essential." Counter Gear POM Support "The counter gear is supported by POM from a low-friction plastic bearing set, which is expected to increase torque due to low friction. 520 bearing installation is recommended." The bottom has been raised to the maximum extent. The switch cover and the motor side cover have become thinner, so they have been removed. There are no problems with use. The switch protrudes, so please cut it to your liking. Thank you very much.