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Johnston and Jeff Fat Balls without nets. Best fed from a special feeder or bird table. Made with suet, cereals and seeds. Fat is a very valuable energy source for all wildbirds especially in colder weather.. Composition. Cereals, oils and fats, natural minerals, sunflower seeds.. Analytical Constituents. Protein 8.1%. Fat 18.6%. Fibre 3.3%. Ash 7.4%