1594 carbon reinforced K parts (Sutefuna) 54594 Tamiya hop up Options No., 1594 OP. Optional parts for the TB-04 made of carbon-reinforced resin. I hope you will take a look at them as well. We will respond to you in a courteous and prompt manner Accesorios RC Tamiya TAMIYA Hop Up Options CONCEPT Reinforced K Parts Gear Box 54983 No.1983 OP.1983 Refuerzo Chasis Coche RC