One pound of colonized grain spawn in a glass quart jar consisting of rye, millet, milo, oats (one or a mix) inoculated with a living culture of your choice or availability. Clean and ready to run on a pasteurized or sterilized substrate. With a little work turn 5 pounds of dry substrate into mushrooms!! Or expand and make more spawn. I make my spawn to order so please allow me a couple days from time of order to insure a healthy and viable culture.