Up for sale is CARLISLE POWER CARLISLE XS SNOWMOBILE BELT XS816 . The vendor part number is XS816 . Please read TITLE carefull to know what you are getting because the catalog desccription can be a general description.. Catalog description�.. Knowledgeable snowmobilers agree - the drive belt of choice for high performance is Ultimax XS XS is designed for high horsepower sleds and delivers superior performance and longer belt life XS features a specially formulated rubber compound found in no other snowmobile belt Tests prove that XS transfers more power and runs coole For high performance sleds, capture the power with Ultimax XS