CAP, SNAP BLU 16MM F/USE W/BLD DRAWING TUBES 13MM (1000/BG) McKesson Polyethylene Snap Caps 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 Not Made with Natural Rubber Latex Packaged: 1000 Per Bag