Specification:Color: TransparentMaterial: High temperature resistant polypropyleneThickness: 0.06mmSize:#1 – 18*35CM/7.1*13.8″#2 –25*50CM/9.8*19.7″#3 –32*50CM/12.6*19.7″#4 –39*65CM/15.4*25.6″Features:>> Suitable for mushrooms, fungus, grains.>> Square gusset bags can help increase the amount of mushrooms.>> Using these bags for running spawn, and the mycelial fermentation cycle can be shortened.>> Air vent window design saves a lot of labor, you do not require drilling and oxygenation. And it can isolate bacteria via nanotechnology.>> Polypropylene, high temperature resistance.Package Included:50 Mushroom Grow Bag