The slow feeder encourages cats to work for their food in a fun way. The smart design plays on a cat's instincts to paw out smaller portions of food, which stimulates activity and reduces binge eating. The tubes have rounded ends, making them easy to use and clean. There are 3 short narrow tubes and 2 long wide tubes so you can change between difficulty levels. The sloped surface can be used to add extra kibble in the front. Insert kibble or treats into the various tubes for your cat to smell and paw out.