• Replacement for 30-34mm bicycle seat post dust cover in black silicone. • Lightweight and easy to install, dustproof, waterproof, and with exquisite workmanship. • Dimensions: 15 x 39mm (H * D); Seat post diameter: 30-34mm. • High elasticity, fits perfectly to the seat post. • Compatible with most 30-34mm seat posts. • Robust and durable silicone material. • Excellent decoration for your bicycle. • Professional installation is suggested. • Before buying, check the size. • Tolerate differences of 0-3mm due to manual measurement. • Package content: 5 bicycle seat post rings.