and high quality Using these bags for spawning can shorten the hyphal fermentation cycle Square gusset bags can help increase the number of mushrooms. Suitable for mushrooms, fungus, grains. suitable and bamboo wood ganoderma wood chips The venting window design saves a lot of labor and you don't need drilling and oxygenation. And it can separate bacteria by nanotechnology. Polypropylene, high temperature resistance Colour:White Material:PVC Product unfolded size: 18 x 35CM, folded size: 10 x 35cm Single layer thickness: 0.08mm Air vent window size: 55x55mm Air vent window aperture: 0.2um Package Contents: 100 x Growing Bags Only the above package content, other products are not included. Note: Light reflection 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.