SmartyKat Mousy Mayhem Compressed Catnip Mice Cat Toy. Made with pure and potent insecticide-free catnip, these catnip-shaped mice will encourage your cat to frolic, romp, and play. This stimulating set of two have felt ears and elastic tails that are great for swatting and pouncing. Compressed catnip toys give your cat all the fun of loose-leaf catnip without the mess. Most cats react to catnip with a burst of playful energy, followed by a purrfectly calm and relaxing bliss. 2.75 In. W. x 2.50 In. H. x 0.75 In. L.