100PCS 56MM SYNTHETIC FILTER DISCS: Cellulose filter paper about 56mm in diameter, 0.1mm thick, 100 pieces, enough for you to use. Medium speed filtering: 35 - 70 sec, can remove particles 15 to 20 m, the ash content is not more than 0.15% HIGH QUALITY: Quantitative ashless filter papers are made from high quality fibres paper and have good role to pressure and heat. BREATHABLE: Filter papers ensure the circulation of air inside and fresh air outside and are indispensable for mushroom cultivation. HOW TO USE: Qualitative filter paper can be installed on the hole of the lid of a wide mouth can; please note that the smooth surface of the synthetic filter disc faces the liquid, and the surface needs to be cleaned and dried before use. WIDE APPLICATION: Quantitative filter paper are widely applied in buchner funnels and wide mouth can lid, can be cut into wide mouth sizes, suitable for mushroom cultivation; DIY them into normal mouth size or other smaller sizes.