These Associated factory replacement rear shock springs are rated at 3.50 lb/in with a length of 83mm, 10.25 turns, and a 1.5mm wire diameter. The black finish helps identify this specific spring rate at a glance when tuning. Sold as a pair of metal coil springs sized for 16mm shock bodies. Features: 3.50 lb/in spring rate 83mm length 10.25 turns / 1.5mm wire diameter 16mm shock body fitment Black finish for easy rate identification 7/7/26 cs