12x 250ml regular mason jars with a 1/4 quart of perfectly hydrated and sterilized rye grain.
Hand made these grain jars ready to inoculate. There are a self-healing port and 0.2-micron syringe filter equipped at the jar lid for sterile incubation and fresh air exchange during the colonization.
Grain jars are pre-sterilized at 15psi for 90 minutes at 121 Celcius degrees.
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