I got one tooth less this time. Leave you closer to your powerband when you ride. It's a sproket. A front sprocket, goes on the front. It's a good sprocket, no defects on delivery, smooth chain travel. It does what it should, it was a great price. I'm done, lol. It's a front sprocket. It's important, but there's little to be said about it. This one's actually very good though.