bike Suspension seatpost 25.4 /27.2/ 28.6/30.9/ 30.8/ 31.6mm hydraulic Damping Bike Seat Post Seatpost 350mm Specification: Brand:GANOPPER Material: Aluminium Alloy Color Options: Black Damping: Coil Spring Diameter: 25.4mm/27.2MM/28.6MM/30.8MM/30.9MM- - - - - (real outer diameter , no adapter) Length: 350 mm Weight: approx 502g(25.4*350mm) 560g(27.2*350mm) 597g(28.6*350mm) 607g(30.9*350mm) Fit for: Road bike ,MTB ,Mountain bike ,DH ,FR "GANOPPER" "ZOOM" two brands are shipped at random, the model appearance size is the same Package Included: MTB suspension seatpost*1