Amazon.com : 31.6 Suspension Seatpost Mountain Bike Seat Post Alloy Aluminum 31.6mm Down Hill Bike Seat Saddle Tube 350mm MTB Seatpost : Sports & Outdoors
ZOOM Aluminium MTB bike Seat post Travel Suspension damping Seatpost 27.2- 33.9mm | eBay
Zoom Ultra Light Aluminum Alloy Bicycle Seatpost 27.2 28.6 30 30.4 30.8 31.6 33.9mm MTB Bike Suspension Seatpost - China Bicycle Seatpost, Cycle Seat Post | Made-in-China.com
ZOOM Bike Seat Post 27 2 Seatpost Suspension Dropper Post 31.6/28.6/30.4/30.8/33.9mm MTB Suspension Shock Absorber Accessories