Who needs bells and whistles when you can have just the bells in the Hartz At Play Midnight Crazies Cat Toys? Your cat will love chasing around this fun rolling toy that's made from a durable plastic ball containing a single, tinkling bell. Through play, cats exercise their natural instincts to explore and thrive in the world around them. Filling your cat's environment with toys that stimulate all of their natural play needs will help keep them healthy, active and engaged. This package contains multiple balls so they can chase them, lose them, and start all over again.