Description: There are multiple color options for your selection to match your bike style, and this silicone ring also could be used as seat post travel indicator for re-positioning seat post. Providing additional protection for your seat tube, this silicone ring protects the seat tube from dirt, water, sand and mud and prevents the surface of the seat tube from being scratched by intrusion of foreign objects. It is constructed of silicon material. 2 size options for your selection with 25-30mm that covers 25.4/27.2mm and 30-35mm that covers 30.4/30.8/30.9/31.6/33.9mm seat post diameter. It is suitable for 25.4/27.2mm diameter seat rod or 30.4/30.8/30.9/31.6/33.9mm diameter seat rod. Item Name: Seatpost Dust Cover Material: Silicon Features: Mud Proof, Waterproof, High Elasticity, Flexible Size Details: S, Suitable Size: 2.5-3cm (Approx.) L, Suitable Size: 3-3.5cm (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Seatpost Dust Cover