4x red edition super soft flex leaf springs our new flex leaf springs are 35% softer than stock, manufactured out of high alloy spring steel. Offer more flex and improve articulation! Click here to read a review about these leaf springs on scale4x4 specifications: super dubrable steel leaf springs. Works on tamiya f-350, hilux and rc4wd trail finder stiff spring increases payload capacity simple installation, no modification required eye to eye distance: 120. 57mm / 4. 746in shown installed on scale semi truck front axle (blue) (vvv-s0108) for example (not included) what's included: 4x flex leaf springs (red edition) notes: fits scale semi truck front axle (blue) (vvv-s0108) (z-s0570)