Description Features: 1. High-strength aerospace aluminum alloy tube, 50mm adjustable preload suspension travel, standard clamp with 2-bolts ensures safety during riding. Coil spring damping provides a comfortable experience. Zoom is a professional bike component manufacturer from Taiwan, known for high quality and global market leadership. 2. Spring coil suspension reduces bump impact: Integrated spring coil and damper rubber absorb vibrations while riding, enhancing seat post comfort and reducing shocks and discomfort. Rebound force is adjustable by tightening or loosening the bottom screw. 3. Rebound force and clamp angle adjustable: Adjust the bottom screw to customize spring rebound force according to rider weight for optimal comfort. Saddle clamp angle can be adjusted from -5 degrees to +18 degrees. Dual-bolt clamp design enhances security and simplifies installation. 4. How to choose the size: Check your current seatpost diameter; size markings are located at the lower part of the post (must be removed from frame to view). Select the same size from available options. Alternatively, measure the internal diameter of the frame tube. Compatible with most fixed gear bikes, road bikes, mountain bikes, and universal bikes. Supports rider weight from 50kg (110lbs) to 180kg (397lbs). Notice: Actual color may vary slightly due to different monitor displays and lighting conditions. Allow 1-3cm variation due to manual measurement. Material: Aluminum Alloy Brand: ZOOM Model number: SPS-405 Process: Frosted anode Color/Style: As shown in picture Includes: Option 1: 1 x seat post Option 2: 1 x seat post, 1 x adapter