A snack ball ideally used to train your cat. The snacks fall out from the rolling motion, made of eco friendly material. It has an adjustable opening to regulate the treat output, so the cat can have a playful time and learn some tricks to get her snack. This ball is suitable for all small animal who want to have some fun time with thier toys and get a treat everytime they win. It is a round ball, which 6 cm, not very small which can be swolled or too big which hurts the pet.