This is not a catnip toy even if it may contain some, it came up when I searched for silver vine, and the smell is actually valerian. It is quite strong, but some reviews said it wears off quickly.
Mine went crazy for this and another toy with similar filling. Cute well made toys and the cats liked.
My eldest cat loves this pillow. The kittens love the valerian, but that varies from cat to cat.
It's cute, well-made and very much adored by all my cats. Will be ordering some more!