This series of products is GF/A Glass Fiber (battery) diaphragm, using glass fiber glass fiber as the substrate, glass fiber is inert, chemical stability, non-conductive, can make electrolyte ions through, often used in battery science/zinc ion battery/zinc iodine battery/aluminum battery research field GF-A series,【Gram Weight 】66 g/m,【Hole Diameter】1.63um,【Strength】 0.15 MD-KN/M,【Thickness】0.29mm (100KPA) The size data can be seen in the options, please confirm the size carefully before buying 1 PCS/Package This series of products is GF/A Glass Fiber (battery) diaphragm, using glass fiber glass fiber as the substrate, glass fiber is inert, chemical stability, non-conductive, can make electrolyte ions through, often used in battery science/zinc ion battery/zinc iodine battery/aluminum battery research field