Description Cap Colour Cap Material Septum Hardness °Shore Thickness, mm Pk Cat. No. 10 mm Open Top Cap, 8,5mm Hole Black Polypropylene Blue PTFE/White Silicone, Pre-slit 55° 1,5 1000 548-0392 Black Polypropylene Red PTFE/White Silicone 50° 1,3 1000 548-0390 VWR® 10mm WIDE OPENING SCREW-THREAD VIAL CONVENIENCE KITS ‒ Recommended for