Length = 400mm. It's lightweight, with a weight capacity of up to 230 lb.
Oxford Micro Adjust Alloy Seat Post with Micro Adjust - Silver - 400 x 28.8mm
Polygon 26.8mm Alloy Micro Adjust Bike / Bicycle 200mm Seat Post - Silver
Azarxis Bike Seat Post Seatpost 25.4 27.2 28.6 30.4 30.8 31.6 x 350mm Aluminum Alloy MTB BMX Seat Post Tube Bicycle Saddle Pole with Micro Adjust Clamp for Mountain Bike Road Bike (27.2 x 350mm)
Azarxis Bike Seat Post Suspension Seatpost 25.4 27.2 28.6 30.4 30.8 31.6 x 350mm Aluminum Alloy MTB BMX Seat Post Tube Bicycle Saddle Pole with Micro Adjust Clamp for Mountain Bike Road Bike (27.2)
Azarxis Bike Seat Post Seatpost 25.4 27.2 28.6 30.4 30.8 31.6 x 350mm Aluminum Alloy MTB BMX Seat Post Tube Bicycle Saddle Pole with Micro Adjust Clamp for Mountain Bike Road Bike (25.4 x 350mm)
Oxford Bike Seat Post 31.6mm x 400mm Black BMX MTB Seat Post Micro Adjust Post
