Tein S-Tech Springs are an excellent step towards suspension tuning.They offer a 1.2" drop in the front and a 0.9" drop in the rear for a more aggressive appearance. Their spring rate is:Front: 6.4 kg/mm / 358 lbs/inRear: 4.9 kg/mm / 274 lbs/inComes with a 1 year limited manufacturer warranty. Spring length is guaranteed not to sag more than 5mm and to be clear of any manufacture defects. ? One year limited manufacturer warranty. ? High-grade material adapted to improve guaranteed satisfaction. ? Rubber spring protector sheet to prevent noise (most applications).