Hyperco's Conventional Front Coil Spring — wound from high-tensile chrome silicon wire, ±2% rate tolerance, Hyperco's signature dark blue powder coat. A NASCAR Cup Series supplier. These are the most precisely rated conventional springs you can put on a dirt car — the rate you order is the rate you get. 5.0" OD x 9.5" tall — standard dirt front 150–1200 lb/in in 25 lb steps — covers every front rate Late Models and Modifieds run ±2% rate tolerance — tighter than competitors Chrome silicon wire — won't take a set Dark blue powder coat — easy ID at a glance