Trixie plastic rattling ball is a very nice toy for your cat to play, made of high quality plastic material. It has bell inside for sound. This is perfect toy to keep your cat busy in playing all day. Diameter: 4 cm. BOX CONTAINS Trixie Four Plastic Rattling Balls for Cat, 4 cmDiameter: 4 cm. Provide lots of fun to your cat. Comes with a bell inside. Made of high quality plastic material. Very nice rattling ball for cats to play.