Description: This bicycle guide wheel is made of high-quality materials, ensuring durability and long-lasting performance. Its lightweight design adds minimal weight to bike, while its sleek black finish adds a touch of style to ride. Whether you're a casual or a serious cyclist, this guide wheel is a practical and affordable upgrade for bike. Say goodbye to chain drops and jams with the bicycle guide wheel order yours today and take cycling experience to the! Item Name: Derailleur Pulley Material: Aluminum Alloy, Metal Features: Rustproof, Corrosion Resistant, Universal Fit Size Detail: S, Diameter: 4.3cm/1.69" (Approx.) L, Diameter: 5cm/1.97" (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 Derailleur Pulley Deep-toothed guide wheel reduces chain drop for smooth speed changes and labor-saving riding. Made of high-quality material, durable, rustproof, and corrosion resistant for prolonged use. Multi-tooth design offers precision in chain engagement, ultra smooth performance, and significantly reduced friction. Good compatibility and prevents chain jamming with mounting shaft suitable for 4MM, 5MM, and 6mm sizes. Size Details: S,The diameter of each sticker is 4.3cm. L,The diameter of each sticker is 5cm.