Berry Fat Ball No Nets. Fat balls are a highly nutritious, all year round treat containing grains, fats, minerals and seeds. Afavourite with many wild birds, they are best fed from hanging feeders or on bird tables. IngredientsKibbled Maize 35%, Wheat 25%, Beef Tallow 16%, Calcium Carbonate 10%, Red Dari 9%, Striped Sunflower Seeds 5%.