Features: 1. High-strength aerospace aluminum alloy tube with 50mm adjustable preload suspension travel. Standard 2-bolt clamp design ensures secure attachment and riding safety. Coil spring damping system provides a comfortable riding experience. Zoom is a professional bicycle component manufacturer from Taiwan, known for high-quality products and leading market share globally. 2. Spring coil suspension reduces bump impact. Built-in coil spring and damper rubber effectively absorb vibrations during riding, enhancing seat comfort and reducing shock and discomfort. Rebound force is adjustable by tightening or loosening the bottom screw. 3. Rebound force and clamp angle are adjustable. Adjust the bottom screw to customize spring rebound force according to rider weight for optimal performance. Saddle clamp angle can be adjusted from -5° to +18°. Dual-bolt clamp design enhances stability, safety, and ease of installation. 4. How to Choose the Size: - Check your current seatpost diameter. The size is usually marked on the lower part of the post (remove it from the frame to see the marking). Select the same size from available options. - Measure the inner diameter of the frame’s seat tube. Compatible with most fixed gear bikes, road bikes, mountain bikes, and universal bike types. Suitable for riders weighing between 50kg (110lbs) and 180kg (397lbs). Note: Actual color may vary slightly due to differences in monitor displays and lighting conditions. Allow 1-3cm variation due to manual measurement. Material: Aluminum Alloy Brand: ZOOM Model Number: SPS-405 Process: Frosted Anodization Color/Style: As shown in picture Package Options: Choice 1: 1 x Seat Post Choice 2: 1 x Seat Post, 1 x Adapter