Replaces the factory rubber for a stiffer slightly oversized unit. This will tighten up the door connection to the car and make them have a stronger connection when closed. this removes a lot of sloppiness in the miata chassis. Simple installation means you can get back out carving those corners in your miata faster and with the added rigidity that comes with stiffening the chassis.

the doors will be slightly harder to close as these are made to form fit after a few closes for an almost 100% lock up on to the door catches.