Tein S. Tech Springs are an excellent step towards suspension tuning. They offer a more aggressive appearance and increase road holding capability. Designed to be used with OEM or OEM replacement shocks. Each application is road tested in North America for the proper balance between performance and comfort. Specs: Drop: F: 1" / R .6" Spring Rates: F: 2.9kg/mm, 163lb/in / R: 4.3kg/mm , 241lb/in FITMENT: Mazdaspeed3 2007-2009