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Pre-sterilized PF TEK mushroom growing jars. There are 4 holes in the lid under the foil for easy inoculation. The easiest way to grow mushrooms! 6 Re-Useable 1/2 pint glass jars. Made to order! Freshness is of no concern! Perfect proportions of Organic Brown Rice Flour, Organic vermiculite, and purified spring water will make your mushrooms happy! The layer of vermiculite allows for gas exchange as well as acting as a contaminant barrier. Only the best for my personal mushrooms And that's what you are purchasing.