The SmartyKat Crazy Creepers Cat Toys allow you to extend the fun and keep the catnip fresh! The cute and soft plush trio of mice are irresistible and perfect for a multi cat household. Refillable catnip toys allow you to refresh the catnip in your cat's favorite toy for endless fun. Pure bliss tubes are sealed to keep catnip fresh and have a small opening that makes it easy to refill your toy. Most cats respond to catnip with a burst of energetic activity followed by a perfectly calm mellow period.