Pack of 2 Buchner funnels. Crafted from thick-walled borosilicate glass. Funnel rims are beaded. Porosity of Course(C) is 40- 60 Microns, Porosity of Fine (F) is 5-15 Microns, Porosity of Medium (M) is 15-40 Microns. Include fritted discs. Funnels feature beaded rims