3 Diameters Are Available: 27.2mm, 30.9mm, 31.6mm are all available for sale, other sizes can be selected as 27.2mm +28.6/30.0/30.4/30.8/33.9mm diameter-reducing sleeve combination Easy Installation: no cables or housing, just gently insert the purchased seat tube into the frame, and then lock it. IMPORTANT: Insertion is required to the minimum insertion depth scale Cable-Less Cable-Less Hydraulic Control: Smooth oil-gas structure enables single-hand operation to adjust seat height instantly while riding. No tangled cables – perfect for trail riding and steep descents Simple Operation: Just pull the lever and sit to adjust seat height Durable and Lightweight: Hydraulic dropper integrated inside 7075 alloy tube RIDE SMARTER WITH MEROCA'S HYDRAULIC DROPPER SEATPOST Imagine effortlessly adjusting your saddle height mid-trail – whether climbing steep hills or bombing down rocky descents. MEROCA’s cable-less hydraulic dropper seatpost gives you instant control with one hand, keeping you stable and confident on any MTB terrain. KEY ADVANTAGES: ①Oil-Gas Hydraulic Locking: The sealed nitrogen/oil chamber locks securely at millimeter-level precision. No slips, no play – just reliable support when you need it most. ②All-Weather Sealed Design: Triple-reinforced wipers and IP67-rated seals repel mud, water, and trail debris. Tested in monsoon conditions with zero performance loss. ③Crash-Proof Aluminum Build: Forged from T6-6061 aluminum alloy (hardness: 85HB), this seatpost handles impacts that bend steel tubes. YOUR RIDING SCENARIOS: 1.Technical Climbs: Lower saddle for better weight distribution 2.Downhill Sprints: Drop seat fully for aggressive bike handling 3.Long Rides: Fine-tune saddle angle to eliminate pressure points WARNING: NEVER adjust seat height while moving! Always set position BEFORE riding. Check safety line alignment during installation. UPGRADE YOUR RIDE TODAY – Experience the freedom of cable-free precision with MEROCA's professional-grade dropper seatpost!