Features: NBR rubber provides excellent abrasion resistance, heat resistance, and oil resistance. This is a generic item that fits a variety of vehicles when it comes to size. Size: Upper inner diameter 1.2 inches (30 mm), Lower inner diameter 1.9 inches (48 mm), Total length 7.7 inches (195 mm). *For safety, please make sure to install it under a certified motorcycle shop mechanic, etc. If there is any defects or abnormalities, please discontinue use immediately. Please check the condition regularly for safety.