Perfect for long life, with added style. Unique tooth design increases sprocket life up to 6% compared to similar designs. Steel teeth for longer system life; aluminum core for reduced rotational mass - 30% lighter than the OEM part. Includes interchangeable black, red, gold, silver inserts.NEW in original retail package. We are an authorized Supersprox dealer. All items in our store are 100% BRAND NEW and genuine. Hours of Operation Orders are processed by our warehouse Monday through Friday. Be sure to open your order immediately upon receipt to check for accuracy. All tags must be attached, retail packaging must be sealed and in brand new condition, and item must not have been worn, used or installed.