Mixed Cellulose Ester membrane filter ,sterile,grid,white, 0.45um 47mm MCE Memb Filter 0.45um 47mm grid 10406871 Whatman™ 10406871 Grade ME25/21 STL Sterile Gridded White Mixed Cellulose Ester Membrane Filter with 3.1mm Black Grid, Pore Size: 0.45µm, Diameter: 4.7cm (Pack of 1000)