GoCat da birdie refill is the refill attachment made to fit the GoCat da bird teaser wand. Handcrafted in the USA from top quality materials. This will fit all rods that have a cotter clip on the end. Our cats absolutely love all the GoCat cat toys. This gets all of my cats out from wherever they are lazily lounging. As soon as they hear the sound of this toy, my cats are ready to play! they all love to play. It is easy to just sit and play, even while watching t.V.! the toy measures approximately 2 and 1/2 inches. Made in USA.