Purrk! Playfuls are stimulating cat toys which are infused with Silvervine. Silvervine, a non-toxic plant grown in East Asia, has long been known to elicit euphoric responses in cats! The reaction to Silvervine is similar to the catnip response, but may be more intense! Unlike catnip, cats often return for more Silvervine repeatedly after the effects begin to wear off. Available in three plastic characters, Marvey Mouse, Perky Bird and Frisky Fish.