Cat Man Doo Bonito Flakes contain no additives, preservatives, or by-products. They are an all-natural treat for your pet (not just for cats, dogs love them too!). Bonito Flakes are an excellent source of protein and taurine. Cat-Man-Doo Extra Large Bonito Flakes are just that. Our Bonito Flakes are two to three times larger than that of our competitors. We have them specially made that way!