Hartz Cattraction with Silver Vine & Catnip® Kitty Frenzy® comes filled with a natural combination of silver vine and catnip attractants that make the hunt all the more irresistible. A power pack of fun! These 12 mice are not only fuzzy, small and lightweight to entice the ‘chase’ -- each has silver vine & catnip for the irresistible lure.-Includes 12 furry colorful mice perfect for indoor swatting and chasing.-Contains a natural, yet potent combination of silver vine and catnip attractants to grab and hold your cat’s attention for enhanced playtime-Silver Vine is a vine that grows in the high mountainous regions of eastern Asia. It produces a natural and effective cat attractant, that stimulates livelier play in more cats when compared to catnip alone-Exercise your cat's natural instincts to explore and thrive in the world around them with toys that stimulate all of their natural play needs-Non-toxic, natural and safe for cats of all ages.