These are rubber tire inserts designed to fit 24mm wheels with 24mm width rubber tires. They come in pairs and the green color easily identifies the insert as a medium firmness. Medium molded tire inserts provide a more neutral alternative compared to hard and soft inserts. Compatible Chassis: TT-02 Type-S, TA07 PRO, TA06, TA06 PRO, TA06 MS, TA05 Ver.II, TB-04, TB-04 PRO, FF-04 EVO, FF-03, FF-03 PRO, TRF419, TRF419X, TB Evo.7, TB Evo.6 & TB Evo.6 MS Chassis Compatible tires: Item 51023, Item 51049, Item 53433, Item 53705 and Item 54256.