Features: SUITABLE. This bike suspension seatpost fit on most bicycles, like road bike, mountain bike, e-bike. It has pain-relieving effect on the back area as it provides optimal-shock absorption during cycling. EASILY ASSEMBLY. Advanced designs, easy to assemble. Help you spend less-time assembling the saddle-post. QUALITY MATERIAL. Quality aluminium-alloy bike seatpost, lightweight, anti-break, very-durable. ADJUSTABLE. The alloy bike suspension seatpost, which has diameter of 1.10" (27.2mm)-1.2''(31.6mm) and length of 13.8" (350mm), adjustable-heads, convenient to install. CHOOSE RIGHT SIZE Check your current seatpost diameter, size mark on lower position of the post (Takes it out from tube to see the size mark). And buy same size from the option. Then, measure the inside diameter of the frame-tube. Specifications: Type: Style-1; Style-2 Color: Black and Red; Black and Black Color Style-1 Size: Approximately. 27.20x350mmm/1.07x13.77in Style-1 Size: Approximately. 31.6x350mm/1.24x13.77in Material: Aluminium-Alloy Weight: Approximately. 500g; 520g Note: 1.Please allow 0-1cm error due to manual measurement. please make-sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Piece Bike Seatpost