We've got a wide selection that you can find here -
http://bellissimoto.com/DrivetrainIndex.htmlBut without a doubt the best option on the market is the AEM factory Magnesium quick change carrier, and sprocket, which complete with titanium hardware weighs only 1 pound!
That is correct, 1 pound total rotating weight from your sprocket/carrier!
This is .6 pounds lighter than the AEM Factory Aluminum quick change carrier and sprocket which is already ridiculously lightweight when compared to stock.
Top it all off with the further beautiful and lightweight hub cover/flange and you have a total weight of 1.5 pounds and your rear end looks this good-