SmartyKat Madcap Mania adorable mouse is refillable for nonstop fun and excitement! Includes a 2-gram tube of SmartyKat pure and potent catnip. Refillable catnip toys are by far the best way to allow you to refresh the catnip in your cats favorite toy for endless fun. Most cats respond to catnip with a burst of energetic activity followed by a calm mellow period.SmartyKat gives pet parents the best of all worlds: SmartyKat products are designed to meet child safety standards and are backed by our 100% satisfaction.