... : SP-P2 Model:SP-P2Brand:TopmostMaterial:Carbon fiberFinish:3K,12K, UDDiameter: Ø27.2, 30.9,31.6,34.9mmLength:300,350, 400mmWeight:UD ... Ø31.6x350mm, 201.2g±5gAttention : Upon receipt of ... : Contact Person: Emily Lin Tel: 86-189-6584-0856Skype: emilylin0725 31.6 carbon bicycle seat post