The Zesty Orange blend suet, is calcium fortified for strong eggs and bones. This special blend of suet is made from quality ingredients for better nutrition. It is specially formulated to provide a higher melting point for year 'round feeding. It has been field tested to attract the greatest variety of wild birds. Suet Plus Cakes also feature the easy open no mess wrapper. There's no internal tray, just unwrap, and insert into your feeder. It is highly recommended to refrigerate prior to opening. No more greasy fingers, and there's less packaging waste.. It's a win-win situation.