Welcome to the "ZTTO Official Store"! Item Name: Bicycle Chain Guide Material: Nylon,Aluminum Alloy Specification: 35mm~31.8mm installation/E-type installation Size Details: 15cm x 9cm/5.91" x 3.54" (Approx.) Description: Using CNC processing, the chain guide has light weight and high strength. It is used on the middle tube of the frame to effectively prevent the chain drop and chain jump. Made of high-strength aluminum alloy material, the chain guide is durable. The length of the product is 15cm, and the width is 9cm. It is suitable for outdoor riding. Notes: We are specialized in selling bicycle accessories, if you have a need, remember to pay attention to us! Due to the light and screen setting difference, the product's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bicycle Chain Guide 1 x Frame Protector 1 x Gasket