BioSafe Columns are biocompatible and precision-machined from virgin PEEK (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 is available in lengths of 2 cm, 3 cm, 5 cm, 10 cm and 15 cm.