They're the lightweight axles found on the TRF420 racing chassis touring car kit. They may be used as spare parts in the TRF420 or as Hop-Up Option parts on some of Tamiya’s TA or TB touring automobile devices.
• TRF420 Wheel Axles x2
• Each axle weighs more or less 1.5g significantly less than counterparts in Item 51445 TRF417 Wheel Axles (2pcs.), for less pressure and wear on tires.
• suitable for TRF420, TRF419, TA07 and TB-05 PRO framework vehicles.