I went to Eastons website...they recommend a 2117 or 2216 shaft for a 50 pound bow, a 30 inch arrow (One inch longer than your draw), and a 100 grain tip.

You can do your own search if you would like to change any variables. Go to www.eastonarchery.com, go to "products" and you will see "shaft selection"...then just go ahead!
Good luck!