These Corning® disposable glass Pasteur pipets are available in convenient bulk-packs. One-time use eliminates the danger of cross-contamination of valuable specimens or laboratory reagents. These pipets feature a constriction one inch below the top to facilitate plugging. They are ideal for rapid non-volumetric transfer work in bacteriology, immunology, hematology and serology studies, as well as blood bank and clinical chemistry procedures. "D" series pipets are borosilicate glass. Non-sterile, unplugged.