Description: With help of the silicone ring, it can protect the bike seat post from water, mud, sand or dust after long-distance riding. The material of these seat post silicone rings are corrosion resistance, waterproof, extra soft, and high elasticity. These silicone rings provide extra protection for your seat post. And more, this product is compatible with most bike seat posts, easy to install. It is constructed of silicone material. There are 2 different sizes of seat post silicone rings. This product is perfectly suitable for bike, mountain bike, MTB, and more. Item Name: Seat Post Dust Cover Material: Silicone Features: Flexible, Extra Soft, High Elastic, Easy Installation Size Details: Size: 2.5cm-3cm/0.98"-1.18", (Approx.) Suitable Seat Post Diameter: 25.4/27.2mm Size: 3cm-3.5cm/1.18"-1.38" (Approx.) Suitable Seat Post Diameter: 30.4/30.8/30.9/31.6/33.9mm 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: 2 x Seat Post Dust Covers