These coil springs are intended for Kyosho Mini-Z AWD MR-03 shock use and are listed under part MZA0345SP. The pack contains three pairs in wire diameters 0.3mm, 0.4mm and 0.5mm, each keeping a 5.2mm free length so you can evaluate spring rate changes without affecting ride height drastically.
Swap a single pair to feel the difference in handling: thinner wire gives more compliance while thicker wire increases stiffness. When installing, confirm each spring seats correctly on the shock retainer and ensure symmetry left to right to prevent uneven handling.
Log each trial setup and run repeatable tests to identify the best front and rear combination for grip balance. These springs are a tuning accessory for model-scale suspension systems and not a replacement for OEM parts of different specification.
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