Premium Formula - 100% Balanced Nutrition Timothy hay based formula Natural vitamins Grain-free and soy-free Vet used and recommended These hay-based pellets were specially formulated to be fed free-choice to guinea pigs who normally don't eat enough hay for proper digestive ...Premium Formula - 100% Balanced Nutrition Timothy hay based formula Natural vitamins Grain-free and soy-free Vet used and recommended These hay-based pellets were specially formulated to be fed free-choice to guinea pigs who normally don't eat enough hay for proper digestive health. Guinea pigs will graze on this food the same way they would normally graze on hay because it is a grain-free and hay-based diet that is balanced with the right amount of calories, protein, long-stem fibers, and other nutrients.