100% brand new and high quality;Suitable for mushrooms, fungus, grainsSquare gusset bags can help increase the amount of mushroomsUsing these bags for running spawn, and the mycelial fermentation cycle can be shortenedAir vent window design saves a lot of labor, you do not require drilling and oxygenation. And it can isolate bacteria via nanotechnologyPolypropylene, high temperature resistanceSpecifications:Size: 18 * 35cm Approx.Thickness: 0.06mm Approx.Ventilation window size: 55 x 55mm Approx.Exhaust window diameter: 0.2um Approx.Colour:TransparentMaterial:plasticPackage Contents:50*Mushroom Grow BagOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.