Cartridge: Ultisil AQ-C18, 5µm,120Å, 4.6×10mm, pH range: 1.5-10.0, Pore Size: 120Å, USP listing: L1, Carbon Loading: 12%, Surface Area: 320m2/g, endcapped. Matched HPLC Column ID: 3.0-8.0, Matched Guard Column Holder: 00808-01101 or 00808-01108, 10pcs/pk.