This is an economical way to purchase two HPLC Columns that are often used with LCMS in Metabolomics and many other fields. Each Column has a 2.1mm Internal Diameter and is 50mm Long, packed with 4um particles and 100A pore size and are manufactured with Cogent TYPE-C™ Silica Hydride. Includes the Cogent Diamond Hydride™ and Cogent Bidentate C18™ columns..