Fully hydrated and sterilized quart jars of rye berry mushroom substrate. Each jar sports a self healing injection port and a .2 micron filter patch for gas exchange. Simply inoculate with 3-4cc of your favorite gourmet mushroom culture and shake the jar. Please the jar in normal room temps to colonize. It will take approximately 2 weeks before you will see the beginnings of growth and up to 8 weeks to fully colonize. The more you buy the more you save.