if you haven't heard yet sidewinder sprockets are the best. 100% titanium and indestructable. and if you do manage to f@#$ it up the send you one at no charge to you. the are kinda expensive though i paid 190 for a 45 tooth and they only get more expensive the more you go up. but it is the last one you will ever need to buy.

 

a steel sprocket will out last your bike (if youre a stunter) and only run 80 or 90 dollars from SI