RockShox Reverb 200mm stealth dropper, 31.6mm seatpost. The post rises and falls, however it does sag at full extension. I was using this fine but it will need a service and a re bleed of the remote. I removed the remote lever due to internal routing, but the hose barb is safely there, so just needs reconnecting, and then bleeding. Otherwise excellent condition. Open to offers
eBay