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Hello dear Specifications: Material: Aluminum Alloy Head Color: Black Diameter: 27.2mm/28.6mm/30.4mm/30.8mm/31.6mm/33.9mm Length: 350mm /13.78"(appr.) Features: Brand New and high quality. - Made of aluminum alloy, lightweight and not easy to rust. - Spring suspension seat tube, the use of internal shock mode. - Screws underneath the seat tube can be micro- adjusted stroke rebound velocity. - Make riding more comfortable seat tube. Note: 27.2mm (without adapter) 28.6mm (with 27.2-28.6 adapter) 30.4mm (with 27.2-30.4 adapter) 30.8mm (with 27.2-30.8 adapter) 31.6mm (without adapter) 33.9mm (with 27.2-33.9 adapter) Package Included: 1 x Bicycle Seatpost(no included other stuff) Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.