Bike Accessories Wide Compatibility Durable Reduces Vibrations Ultimate Riding Experience Premium Quality Smooth RideDescription:!!!ATTENTION PLEASE!!!Due to different production batches, the printing of reducing sleeve will be different, but does not affect the normal use, please understand. The seat adopts a Double-Nail rear-drift design.Both locking screws are grade 10.9Torque screws for more secure lockingThe inner tube is made of high-strength The inner tube is made of high-strength aluminum alloyAluminum AlloyFine adjustment screws at the bottom of the seatpost are adjusted at the factory. Can be adjusted according to personal needsSpecifications:Brand: ZoomModel: Suspension Seat Damping: coil springShock absorber travel: 40mm (27.2), 50mm (31.6)Color: black, silver, redSeatpost Length: 350mmMaterial: Aerospace 6061 aluminum alloyDiameter: 27.2mm/31.6mm/28.6mm/30.0mm/30.4mm/30.8mm/33.9mmTips: 27.2 31.6 does not require a adapter. (28.6 / 30.0 / 30.4 / 30.8 / 33.9) is 27.2 plus adapter conversion to use.Note: 30.0 = 30.1 30.8 = 30.9 They can be used with each other.How to choose the right caliberPull out the old seatpost and see if there is a lower section of the seatpost Text (such as 27.2 or 31.6, etc.), and the number is the diameter.Use a thin strip of paper to circle the tube, then draw a mark on the strip of paper.The data obtained by measuring with a ruler divided by 3.14 is the diameter of the circle.Put the toothpick into the frame seat tube buckle (you can also use a ruler(Direct dia