Column 500 UM I.D.X15MM, Packed with Acclaim PEPMAP100 C18, 5 UM, 100A SET OF 5 CARTRIDGES. Column Type: Peptide, for Use With: LC/MS, ESI-MS, MALDI-MS, Diameter: 500um, Pore Size: 100A, Stationary Phase: Acclaim PepMap C18, Material: Stainless Steel.