Ideal for recapping 13 mm blood drawing tubes, glass test tubes and plastic culture tubes .. Designed for easy-on and easy-off use, featuring double thumb tabs.. 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 for easy sample identification.. Not suitable for autoclaving.. There are 1,000 orange snap cap tube closures in a bag..