Vitamin rich fruits, vegetables & nuts. 100% Complete nutrition. Hartz Nutrition Bonanza Hamster & Gerbil Gourmet Diet is the ultimate hamster and gerbil diet. Using our extensive knowledge of small animal care developed from years of research, we have created Hartz Nutrition Bonanza Hamster & Gerbil Gourmet diet is a nutritious blend of tasty, wholesome ingredients, including quality grains, seeds, nuts, fruits and vegetables. Vitamin and minerals enriched pellets are also added to ensure a complete balanced diet. Reward your pet with this highly palatable gourmet diet of carefully selected ingredients.