CSI said in the thread they have on here that they have been discontinued due to supply and demand.

My understanding is that not all 16mm pistons are the same, it all depends on the shock shaft size. But the one that fits our serpent and a few other buggies is no longer being made. They say when existing stock is gone that is it....

I may need to pick some up, the red look interesting, and they say work very well outdoor, but use weird oils, like 70-100wt