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 yellow, 13 mm snap cap tube closures in a bag..