Welcome to our store！</br> 1、This mountain bike guide wheel is made from quality aluminium alloy and bearing, which is sturdy and durable. 2、The bearing has good performance in rolling smoothly with great stability, low chance of getting chain stuck. 3、Aluminum alloy guide wheel body, with lightweight, high strength, anti‑rust and durable features. 4、This rear derailleur pulley has upgraded bearing and 11 tooth guide wheel, which provide excellent performance. 5、The exquisite mountain bike guide wheel is a must‑have and perfect replacement part for your bike. <p class="wang-edit-text"><p class="wang-edit-text"><p class="wang-edit-text"> Item Type: Mountain Bike Guide Wheel Material: Aluminium Alloy and Bearing Suitability: Compatible With 11 Tooth Rear Derailleur Screw Hole for Rear Dial Gear: Approx. 5mm / 0.19in; Two Screws for One Rear Derailleur <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Mountain Bike Guide Wheel Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>