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Here we are offering 4 quart jars of Sterilized Grain Spawn. Each jar has a self healing injector port for inoculation and a 0.45um gas exchange filter. The rye berries are moisture content guaranteed. The 4 jars come sterilized and ready to inoculate right out of the box. Simply inject 2-4 cc or ml. of gourmet mushroom spore solution or LC. Allow to colonize for 10 days or until fully colonized. You can then use the jars as grain masters, for grain to grain transfers or spawn directly to a bulk substrate. Out Grow's mycology products are of the highest quality. You will not find a better substrate then ours for growing gourmet edible mushrooms.