Tube closures are just what you need for recapping most 12 mm, 13 mm and 16 mm evacuated glass blood collection tubes. Double thumb tabs make 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 yellow for easy sample identification. Not suitable for autoclaving .