Whatman 1001-055 Whatman 1001-055 Qualitative Filter Papers; 5.5 cm Diameter; Pore Size, 11µ (Pack of 100): Amazon.com: Industrial & Scientific
1822-050 Whatman 1822-050 Binder Free Borosilicate glass Filter Paper 50 mm (100/Pack) New Laboratory Setup Savings - up to 40%, Magnetic Stirrer, Vortex Mixer, Sample Prep, Centrifuge