http://www.amazon.com/Replacement-Original-Interactive-Play-Guaranteed/dp/B00DE8CXCI

Now you have ULTRA Feather Refills (they work with Da Bird / Go Cat cat feather toys)! No other feather cat toy causes cats to be this wild with excitement! Each feather refill has not two Guinea Fowl feathers but actually four! They'll be much more durable and fly better and YES, THEY SPIN!