We have to get Matt a set to test!
Here's the text from the Stance site. Not sure if this boilerplate description applies to all their apps including the Miata:
http://www.stancesus.com/specifications.php
"Monotube suspension offers many benefits over conventional twintube suspension. Oil and gas are completely separated, which results in precise damping characteristics. Monotube design allows heat to dissipate much quicker. Inverted monotube design can resist extremely high lateral forces compared to an upright twintube suspension."
"Stance coilovers utilize anodized aluminum uppermount and perches.
1 piece integrated pillowball uppermount eliminates noise and increases durability. Cold wound springs minimize sagging. Dust boots protect vital moving parts."
"Individual shock can be easily replaced and overhauled. Shock body is specially coated to resist corrosion."
"15-way adjustable damping allows user to adapt to any road conditions and setup the vehicle's handling appropriately. High quality
polyurethane bushings result in awesome road feel while keeping road noise to a minimum."
"Brackets are reinforced for durability. Special powdercoating technique is utilized to resist corrosion.
Adjustable bottom brackets allow change in height without affecting the preload for precise handling."