Includes 3 pre sterilized grain jar with polypropylene lids. These grain jars are sterilized for 90 minutes at 18 psi. They come with Custom Myco Lids with .2 um ptfe syringe filters which are hydrophobic (Help prevent contamination) and self healing injection ports. The grain type is whole oats which shows as good or better growth as rye berries. They come in either ball or Kerr canning jars and are good for growing all kinds of mushroom and fungi varietys. Please contact us for bulk orders we have better pricing for bigger orders.