Peanut "Boost" Plugs are manufactured using a perfect mixture of beef fat, vegetable oil, peanuts, corn and oats. The "Boost" Ball Plug formulation will attract the widest variety of birds consumers want to see, while harmlessly keeping it from squirrels with our hot pepper flavoring. C&S Plugs are meant to be used in existing wood plug feeders. Give your wild birds extra energy and save yourself the mess!