Set includes 8 balls with jingling bells. Cats love to swat, chase, and pounce. Provides hours of fun for your favorite pet. Measures 1.5 diam. in. 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. This package contains multiple balls so they can chase them, lose them, and start all over again.