Yes, those are pistons, the purpose is to progresively stop the suspension travel to prevent it from bottoming out, this is most usefull when traveling at hight rates of speed over uneven surfaces. The teraflex speedbumps which use polyurethane are an economical (if you consider $400 economical) option to the hydraulic bumpstops like Fox and King.Those look like pistons right? Call me naive, but I didn’t know those were offered on normal suspensions. Bump resistance is probably a better way to term it. Sort of the airbag concept right? I think Rory has something like those on Trailmater his off-road tow truck. I’m thinking they’re made for working under heavy load such as overlanders, armored vehicles, or vehicles that go airborne a lot. I’m thinking they’re made to hit early or what’s the point right? I wouldn’t worry.