The sterilized grain bags with injection ports are great way of making your own master grain spawn with little to no effort. Each bag has a self-healing injection port to inject your liquid culture. Please note that this is a perishable product and must be refrigerated if not used immediately after delivery. Please contact us with any issues within a couple days of delivery. We are not responsible for the product after that period of time or after the bags have been inoculated (whichever comes first). Thank you.