1. carbon bike seat post 2. super light carbon seat post 3. fashion design 4. model: SP-P2 Model:SP-P2Brand: ... :Carbon fiberFinish:3K,12K, UDDiameter: Ø27.2, 30.9,31.6,34.9mmLength:300,350, 400mmWeight:UD Ø31.6x350mm, 201.2g ... Person: Emily Lin Tel: 86-189-6584-0856Skype: emilylin0725 31.6 carbon bicycle seat post