54596 Tamiya - TB-04 Carbon Reinforced Lower Deck OP-1596  [54596]

That's an artificial molded chassis the TB-04 chassis. It uses carbon fibre reinforced resin which adds significant rigidity to any TB-04 chassis device compared to the fiberglass reinforced framework within stock TB-04 kits. A stiffer framework is quite helpful on higher-grip circuits.

Specs:

• Contains TB-04 Carbon Fiber-Reinforced Lower Deck x1
• Compatible with TB-04 framework vehicles.
• It's recommended to pre-tap the framework with a 3mm forming faucet such as for example item 54232 M3x0.5mm Thread Forming Tap whenever inserting screws.