Excellent performance: Seat tube clamp device size, suitable for 25.4 mm to 31.8 mm/1–1.23 cm, can bend and stretch, shrinking on sunny days to reduce resistance and stretching on rainy days to cover mud and water. SUPERIOR QUALITY: The bicycle mudguard is made of high-quality materials, durable and practical to use. MAINA DVANCE: Engineering plastic, high strength, not easily distorted when exposed to sunlight, not easily broken in cold winters, rigid wire joints are not easily loosened. Wide application: The bicycle mudguard is universally used for mountain bikes, road bikes, and folding bikes. GUARANTEE: We strive to provide the best customer experience. Regarding any issues with this product, please email us as soon as possible.