10 pens with blue, cGMP-compliant, indelible ink as required by FDA, ICH, FMEA, and other regulatory authorities. Pens are retractable (i.e., click) style with blue accent pieces and label to indicate ink color. Includes comfort grip for ease of writing. Label on white plastic barrel reads "cGMP Compliant Indelible Ink." Ships with Certificate of Compliance (CofC).