These Schumacher Racing Products rear springs are a factory replacement for the A1, A2, and E1 through E4 platforms, supplied in a medium-soft rate tuning to suit a range of track surfaces and driving styles. Sold as a pair, the silver metal springs are designed to drop directly into the rear shock assemblies of compatible Schumacher 1:10 and 1:12 pan cars. Choosing the correct spring rate is a key tuning step for consistent lap times, and the medium-soft rating positions these between the softest and mid-range options in the Schumacher spring lineup. Features: Medium-soft spring rate for rear shock tuning Sold as a pair Silver metal construction Compatible with A1, A2, and E1-E4 platforms 7/7/26 cs