Air bags for a smoother ride.

And yes, airbags eventually wear out and pop or maybe leak if the line gets chaffed. Using that as a reason to not use them is as silly as saying, "Why use tires, they just wear out or blow out?"

Last set, on our 07. bought them used in 2013, so presuming they were at least 10 years old before one of them popped.

I've split Timbrens in half too...