The springs lowered my Miata as stated in the description. Sometimes the amount the manufacturer says the car will be lowered is nowhere close. The springs also have a great ride, not too stiff.
I ordered those to replace the 26 years Old spring on my NA , they are good for the price considering oem from Mazda are 4 time the price where I live. The drop is a little uneven, the rear gets lower than the front for some times but It corrected itself with time. (Supposed to drop the front more than the rear by the specifications!)