ROCKBROS bicycle seatpost has a customer-centered aluminum alloy construction and long saddle rail clamps for securely fixing under the saddle and to support a heavy loading with a little tilt which can be adjusted with 2-bolt head. Here are three sizes available for you and one size (Dia.?33.9mm) is specially designed for folding bikes.

Features:
Customer-centered， 6061-T6 alloy shaft construction.
2-bolt head with micro-adjustment for easy saddle tilt adjustment.
Long saddle rail clamps evenly disperse weight and impacts.
Easily be attached to a seat without disassembly.
Note: 33.9 * 580mm seatposts are specially designed for folding bikes.

Specifications:
Size: 27.2 * 350mm / 30.9 * 350mm / 33.9 * 580mm (optional)
Color: Red / Blue / Gold / Black (optional)
Material: Aluminum alloy 6061 T6
Recommended use: MTB， road bikes， folding bikes， etc
Package weight: 216g / 7.6oz， 219g / 7.7oz， 344g/ 12.1oz

Package List:?
1 * ROCKBROS Seatpost