brand new and high quality Features: The growing mushroom bag is suitable for mushrooms, fungi, grains and so on. Designed to help increase the amount of mushrooms. Using these bags to spawn, and the mycelial fermentation cycle can be shortened. Air vent window design saves a lot of work, you don'for t need drilling and oxygenation. And it can isolate bacteria through nanotechnology. The mushroom growing bag is made of high quality polypropylene material, with high temperature resistance, durable, breathable and nontoxic. Mushroom Growth Bag only, other accessories demo in the picture is not included! Specification: Material: Plastic 6 Sizes Optional: 15x35cm / 15x50cm / 18x35cm / 25x50cm / 32x45cm / 32x50cm Thickness: 0.06mm Air Vent Window Size: 5.5x5.5cm Air Vent Window Aperture: 0.2um Color: Transparent Quantity: 20 Pcs Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 20 x Mushroom Growth Bags