PP mushroom grow bagsThe bag body is made of polypropylene,Our PP film rolls are made with special raw material compensation mixture, which makes our PP mushroom grow bags not melt and break when being sterilized at high temperature and high pressure.Also PP mushroom grow bags Our same size bags can be selected from 2 options due to different thickness .The thickness is 60um (2.2 mil) and 80um (3.1 mil) respectively.