SP Under Chassis Stiffener:Kyosho Mini-Z MR03 [Eagle] 3817U

Front springs for the MR03. By using springs with uneven pitch, shocks during up and down movements are absorbed more efficiently. The set includes 5 types of springs with different tensions, which can be changed according to the driving style.

Instructions here:

https://www.broadtech.hk/eagleshop/Manyual/3817U.pdf