4T Unicorn Mushroom Substrate 10 Spawn Grow Bags
$16.98
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The bags are made of 3.0 Mil polypropylene and have a 0.2 micron Type T filter patch to ensure proper breathability and filtration of unwanted contamination.
Can hold about 2 pounds of grain.
These are considered "Master" grain spawn bags because they have superior filtration against contamination in comparison to the average grain spawn bag.