McKesson Red Tube Closure, 16 mm-"McKesson Tube Closure Polyethylene Snap Cap Red 16 mm For Use with 16 mm Blood Drawing Tubes, Glass Test Tubes, Plastic Culture Tubes NonSterile"Effective solution for recapping blood drawing tubes, glass test tubes or plastic culture tubes. Precision molded, low density polyethylene (LDPE) to maintain a tight seal during centrifugation, agitation and refrigeration procedures. Color coded for easy sample identification. Tabbed design for easy cap removal. Single thumb tab design allows for the tubes to be placed closely in test tube racks. There are 1,000 red, 16 mm tube closures in a bag.