Bio-Safe(tm) Columns are biocompatible and precision-machined from virgin PEEK(tm) (polyetheretherketone), a strong, inert polymer material, and are metal free for biotechnology and ion chromatography applications. PEEK columns are used when analytes are sensitive to the metals in stainless steel hardware. It comes with or without frits. Our columns are available in 3cm, 3.3cm, 5cm, 7.5cm, 10cm, 12.5cm, 15cm, 20cm, 25cm and 30cm.