Vitakraft Purrk Playfuls Toys for Cats Infused With Silver vine Made From Pet-Friendly, Non-Toxic Materials Available in three plastic characters, Marvel Mouse, Perky Bird and Frisky Fish Purr! Playful Are Stimulating Cat Toys Which Are Infused With Silver vine. Silver vine, A Non-Toxic Plant Grown In East Asia, Has Long Been Known To Elicit Euphoric Responses In Cats! The Reaction To Silver vine Is Similar To The Catnip Response, But Available In Three Plastic Characters, Mary Mouse, Perky Bird And Frisky Fish 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. Infused with Silvervine Made from pet-friendly, non-toxic materials Available in three plastic characters, Marvy Mouse, Perky Bird and Frisky Fish