Hypersil GOLD HPLC Column 10x20mm. GuardColumn, Reversed Phase, Carbon Load: 10%, Max. Pressure: 4300 psi (300 bar), Particle Size: 12 um, pH: 2 to 9, Pore Size: 175A, Surface Area: 220m2/g, Temperature: 60deg C, USP Type: L1, Stationary Phase: C18, Dimension: 10x20mm