oh my bad
Its a self sealed bag that has a channel in the middle to go over the coilover to take place of the spring
THat way, you can leave it at a lower PSI and a stock type ride using the coilover as a shock, or if you want to throw some performance at it, up the PSI it makes a stiffer spring rate (you set up height with the spring preload collars and height with the base)





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