This flexible chassis has been significantly modified from the jig-built flexible chassis. The specifications are as follows: Reinforced Unit Used "Changed to N-02T-01 reinforced unit" Underside Raised Liner Included "To prevent the chassis bottom from hitting the ground when using 23mm tires, raising the chassis bottom is essential. A liner is inserted to raise the bottom by about 1mm and polished." Battery Cover Removed "Battery is held in place with a rubber liner for weight reduction." Damping Rubber "Provides solid damping to keep jumps low and landings smooth. Black spring with one coil cut, essential for 3D courses." HG Carbon Rear Roller Stay "Chassis shaft cut, aluminum shaft black countersunk screws used. Tamiya carbon is used for anti-sagging as it secures the shaft better, resulting in longer use and fewer irregularities." Axle Hole Reamer Applied "Axle holes have individual differences, and some holes may not fit 620 bearings, so they have been expanded with a 6mm reamer." Spur Gear Relief Processing "The gear covers have been shaved to prevent the spur gear from contacting them." Front and Rear Bumper 1.5mm Bottom-Raised Reinforcement "Bottom raising is essential for bank through when attaching brake stays. Also, because the base becomes weaker by raising it, carbon reinforcement is applied from the inside and reinforced with black instant glue on both front and rear." Bumper Cut "The post-processing after bumper cutting has not been touched. It is recommended that you adjust it when installing AT or anchor systems." Normal Terminal Voltage Adjusted "Normal terminals, if well-polished, have better electrical conductivity and can be used longer than gold terminals, which get scratched. Each voltage is also increased with brakes." Normal Gear Cover Screw Fastening "Normal gear covers often come loose, so they are secured 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 with low friction. 520 bearing installation recommended." The chassis is designed to be durable and stable. It is a chassis that bottoms out quite a bit, so gear relief is necessary to prevent it from going through. The voltage increase can change the speed by 1000 RPM, so consider increasing the voltage, securely fix the motor, and use a chassis with solid suspension and damping. The switch protrudes, so please cut it to your liking. Thank you very much.