RockShox Reverb Stealth Dropper Seatpost - 31.6mm 150mm Black 1x Remote C1. The Reverb C1 Stealth offers new travel options and an overall shorter post length allowing more riders to benefit from longer travel options. Our new Vent Valve Technology allows for an easy on-the-bike solution to the squish of the past. The ALL-new Reverb Stealth is here.Features Vent Valve Technology for super simple service if the need arisesShorter overall post lengthand Stealth internal cable routingAdjustable return speed by turning the collar on the remote1650 mm hose lengthThe Connectamajig hydraulic coupling hose allows initial set-up without the need to bleed the system