Features: 1. High-strength aluminum alloy tube with 50mm adjustable preload suspension travel. The 2-bolt clamp ensures safety, while coil spring damping provides a comfortable ride. 2. Spring suspension reduces bump impact with built-in coil and damper to absorb vibrations, improving comfort and reducing shocks. Rebound force is adjustable via the bottom screw. 3. Adjustable rebound force and clamp angle (-5�� to +18��). The 2-bolt clamp enhances safety and ease of installation. 4. Size selection: Check your current seatpost diameter or measure the frame tube's inner diameter. Compatible with most fixed-gear, road, and mountain bikes. Supports riders from 50kg (110lbs) to 180kg (397lbs). Note: Color may vary slightly due to monitor settings. Manual measurement may result in a 1-3cm deviation. Material: Aluminum alloy Includes: 1 x seat post (option for adapter included).