Tube closures are just what you need for recapping most 16 mm evacuated glass blood collection tubes. Single thumb tab makes for easy-on and easy-off use. Flexible closures protect from aerosols of highly infectious microorganisms. Guard samples against cross-contamination and laboratory work areas against infection and spillage. Precision-molded, low-density polyethylene (LDPE) designed to fit firmly on the tube. Closures remain sturdy under most rigorous laboratory procedures, including centrifugation. Color-coded lavender for easy sample identification. Not suitable for autoclaving .