Features: 1. High-strength aluminum alloy tube, 50mm adjustable preload suspension travel, secure 2-bolt clamp for safe riding. Coil spring damping ensures comfort. A professional bike component manufacturer known for quality and global popularity. 2. Spring suspension reduces bump impact: Built-in spring coil and damper absorb vibrations, enhancing comfort and reducing shocks. Rebound force adjustable via bottom screw. 3. Adjustable rebound force and clamp angle: Fine-tune spring force based on rider weight for optimal comfort. Saddle angle adjusts from -5�� to +18��. Secure 2-bolt clamp for easy installation. 4. Size selection: Measure your current seatpost diameter or frame tube inner diameter. Compatible with Fixed Gear, Road, Mountain, and Universal bikes. Supports riders 50kg (110lbs) to 180kg (397lbs). Note: Color may vary slightly due to monitor settings. Manual measurement may have 1-3cm deviation. Material: Aluminum alloy Model: SPS-405 Finish: Frosted anode Includes: 1 seat post (option for adapter included).