The Silvervine Jumbo Cuddle Vegetable Collection toy has been extensively researched in order to give yout kitty the best toys possible. These toys have been tried and tested on over 100 domestic cats and are completely cat-approved. Like catnip, Silvervine is all-natural and non-toxic but Silvervine is much more potent. The cat toys are filled with 100% Silvervine shred, not just a small percentage of Silvervine power and cotton like some other Silvervine toys on the market.