and high quality Characteristics: The growing mushroom bag is suitable for mushrooms, fungi, grains, and similar applications. Designed to support mushroom cultivation and help reduce the mycelial fermentation cycle. Features an air vent window that eliminates the need for drilling or additional oxygenation steps. The vent includes a 0.2-micron filter to help prevent contamination. Made from high-quality polypropylene material with high temperature resistance, durable, breathable, and non-toxic. Intended for spawn preparation and mycelium growth. Note: Mushroom Growth Bag only; other items shown in the image are not included. No retail packaging. May have a 0–1 cm size variation due to manual measurement. Color may vary slightly due to monitor differences. Specifications: Material: Plastic (Polypropylene) Size: 14 x 28 cm Thickness: 0.06 mm Air Vent Window Size: 5.5 x 5.5 cm Air Vent Window Aperture: 0.2 micron Color: Transparent Quantity: 10 pieces Package includes: 10 x Mushroom Growth Bags