Thomson 31.6 mm Aluminum Rigid Standard Bicycle Seatposts
About Thomson - Thomson is leading with innovative design for two primary markets - aerospace and cycling.
The seatpost diameter must match to the seat tube diamater of your frame. If replacing a seatpost, you can usually find this measurement etched near the bottom of your current post.
Rigid seatposts are the most common type of seatpost with no suspension or dropping capability.