[PAY ATTENTION]Please measure and confirm the exact post diameter required for your bike. [MATERIAL] Made of aluminum alloy, Lightweight strong and durable.Comes anodized in Black,Colorfast Surface,Great Anti-corrosion [SIZE]Diameter: 25.4/27.2/28.6/30.9/31.6mm; Length:300mm; [SAFE LINE MARK]There is a safety line mark on the seatpost. Please insert at least above the minimum safety line when installing the new seatpost. [USE&FIT]Widely use in most road bicycles, fixed gear bicycles, Ebikes, downhill bicycles, rail bikes, MTB, etc. Color: Black Material: Aluminum Alloy<br><br>Package Contents: 1 x Bicycle seat rod Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.