Pasteur Pipet, 5 3/4" Long, Soda Lime Glass, Bulk Pack, Non-Sterile, Non-Plugged. Disposable glass Pasteur Pipets are available in convenient bulk packages. 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. NOTE: PIPETS ARE MADE FROM SODA LIME GLASS. Do not pipet by mouth. We suggest using a mechanical pipetting device with these pipets.