The light blue caps are PTFE, dark blue are nylon, dark green are RC and lime green are PES; Septa are available either non-slit or pre-slit; Maximum fill line on the side of the vial, suitable for filtering a maximum of 1 mL; Closure tool can close 9 (3 x 3 format) vials at a time . Thomson Nano Filter Vials 0.2µm & 0.45µm - BPES