EMD Millipore S-Pak HAWG047S6 Mixed Cellulose Ester Sterile Filter Membrane， 0.45µm Pore Size， 47mm Filter Diameter， White， Gridded Surface (Pack of 600)<img src="http://ecx.images-amazon.com/images/I/41B4-SwVO6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31IsOSl-egL.jpg" noproxy>