Mr Johnson?s Supreme RAT & MOUSE MIX is a fibrous, nutritious and wholesome blend of cereals, grains, vegetables, seeds, mealworms and extrusions ? supplying Rats and Mice with a tasty, healthy food in a variety of textures to help with dental wear.Mr Johnson?s Supreme RAT & MOUSE MIX is a complementary feed for rats and mice and should be fed together with a small quantity of suitable fresh fruit & vegetables daily and fresh clean water must always be available.