This lightweight crinkle ball has a loop that attaches to any rod or string toy or leave it out on its own for your cat to bat around. When in motion, this ball shimmers and really attracts the cat's attention because it looks so animated. Cats respond to the intriguing crinkly sound and like to bat it around the floor with or without your help. Approximately 10cm/2.5” diameter, larger than most crinkle balls.