Grace Alltech Alltima C8 Reversed-Phase HPLC Columns, 5um Particle Size, Length: 250 mm, Carbon Load: 9%, Column Format: Analytical Column, Column Type: Reversed Phase, Diameter: 4.6 mm, Endcapped: Yes, Packing Material: Silica, Particle Size: 5 um, Pore Size: 100 , USP Type: L7