25mm x 150mm borosilicate glass culture tube with clear cap. These autoclavable culture tubes are the highest quality tubes on the market and the industry standard for long-term culture storage. Their large size allows for longer viable storage of culture slants than smaller tubes. They are extremely easy to work with which makes transfers a breeze. This product can be sterilized and reused over and over again. We also sell culture tube racks that are specifically designed for these tubes. Perfect for the long-term storage of cultures via a culture slant.