During this incubation period, mycelium uses the essential nutrients such as carbon, minerals, and water from the waste plant product.[42] Some of the organic substrate components include cotton, wheat grain, rice husk, sorghum fiber, agricultural waste, sawdust, bread particles, banana peel, coffee residue, etc.[43] The composites are synthesized and fabricated using different techniques such as adding carbohydrates, altering fermentation conditions, using different fabrication technology, altering post- processing stages, and modifying genetics or biochemicals to form products with certain properties.[41] Fabrication of most of the mycelium composites are by using plastic molds, so the mycelium can be grown directly into the desired shape.[42][43] Other fabrication methods include laminate skin mold, vacuum skin mold, glass mold, plywood mold, wooden mold, petri dish mold, tile mold, etc.[43] During fabrication process, it is essential to have sterilized environment, a controlled environment condition of light, temperature (25-35°C) and humidity around 60-65% for the best results.[42] One way to synthesize a mycelium based composite is by mixing different composition ratio of fibers, water and mycelium together and putting in a PVC molds in layers while compressing each layer and letting it incubate for couple of days.[44] Mycelium based composites can be processed in foam, laminate and mycelium sheet by using processing techniques such as laster cutting, cold and heat compression, etc.[42][43] Mycelium composites tend to absorb water when they are newly fabricated, therefore this property can be changed by oven drying the product.[43]