These colorful snap-on closures are an effective way to recap blood drawing tubes, glass test tubes and plastic culture tubes. They are precision molded from low-density polyethylene (LDPE) and maintain a tight seal during centrifugation, agitation and refrigeration procedures. They are available in bright translucent colors for sample identification purposes. The caps feature a single thumb tab for easy removal and close nesting in tube racks. Features: • Economical way to recap glass tubes, regardless of manufacturer • Prevents spills and evaporation by employing a liquid tight seal • Available in seven translucent colors that correspond to Vacutainer® cap colors: Natural, Blue, Green, Lavender, Red, Gray, and Yellow • Caps can be written on with indelible ink for easy sample identification