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. .