Nitrocellulose Membrane, Precut, 0.45 µm, 9 x 12 cm #1620117 Use this precut 9 x 12 cm nitrocellulose membrane for transferring nucleic acid and proteins: 0.45 µm pore size; Optimal medium for transferring ssDNA, RNA, and low molecular weight proteins; Recommended for western, northern, and Southern blotting; For more information, see the 0.45 µm Nitrocellulose Membranes product page.