Tein?s S-Tech spring system is an excellent step towards suspension tuning. These springs offer approximately a 27-35mm drop (depending on make/model) for a more stylish appearance and increased road holding capability. Designed to be used with OEM or OEM replacement shock absorbers. Each application is road tested in the UK for a proper balance between performance and comfort. These springs are produced with Vanadium (SAE9254V), which is durable, lightweight and designed to keep more spring stroke.