Cats love to chase things that remind them of small animals. It triggers their instinctual nature to hunt, attack, play and pounce. That gives them exercise, it trains their senses, and it gives them a whole lot of fun. Petmate Cat Crazies in a 4 pack does all of the above. These unique toys are not accidents they way they are made; their design is patented because of how successful it is at entertaining cats. Petmate Cat Crazies can give your feline friends hours of play without stopping. A with a 4pack, one package will last months. Or you could spoil your cat and give it all four toys at once. That will a sure way to make your cat go happynutty. The toys are compact, which makes them easy to carry and bring along when kitty has to go traveling. They also make a great toy to bring when the cat has to go to the vet or the pet hotel for an extended stay and needs some familiar entertainment. To recap, the benefits of Petmate Cat Crazies include: 4 different colored Crazies to keep your cat busy for a long time. Small design for easy carrying and traveling. A patented design that is tested to entertain cats and trigger their instinctual nature to hunt and pounce.