Features: 1.In order to reduce some of the impact during cycling, it is very suitable for mountain bikes to cope with difficult roads. 2.Features: Aluminum alloy spring, no deformation, good shock absorption performance. 3.Carrying capacity: 44-330lb. Clear the installation reference scale. Adjust the position of the clip to get a comfortable height. 4.Special alloy spring steel material, sturdy and durable. The side is engraved with a scale to adjust the position. Not easy to deform, wear-resistant, high toughness. The protective cover is made of silica gel, which has good adsorption and high stability. Installed between the seat cushion and the saddle tube.Easy to install and remove. 5.Scope of application: Suitable for mountain bikes, road bikes, fixed gears, etc. Specification: Material: Aluminum alloy Main Body: Special Alloy Spring Steel Clamp: 6061 Aviation Aluminum Protective Cover: Silicone Bearing capacity: 20-150kg / 44-330lb Package List: 1 x Bicycle shock absorbers 1 x Cl