mushroom growing bags,autoclave bags with filter ,CO2 Cultivator Bag :open 15cmx50cm,fold 8cm X 50cm typically for 3-6 pounds block,0.2 Micrometre filter ,Heavy duty 2.5 polypropylene Sealable, Autoclavable and Durable grow your own mushrooms in bulk 100% premium mushroom growing substrate Fortified with all necessary Breathable Filterability - Mushroom grow bags with 0.2 Micrometre Filter allows free exchange of while preventing the entry of pollutants. Grow like mushroom growers around the globe use these bags to dramatically reduce space needed to grow or spawn mushrooms when compared to trays, tubs.Wide Application - Multi-use for inoculation of clone oyster mushrooms, bamboo Ganoderma mushroom, and more. they can be also applied for spawn bags and sawdust fruiting blocks. Great for school projects, hobbies, and even professional mushroom growers, farmers, mushroom cultivation.Colour:As ShownMaterial:PlasticPackage Contents:50 Count X Mushroom BagsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.