The WHEATON® reagent bottles has a narrow mouth and are available in 3 sizes. The borosilicate glass body provides chemical, thermal expansion, shock, and heat resistance. It is autoclavable for applications requiring sterilization. Its Boston round shape is used for applications that require a rounded body, short neck, and narrow mouth to store liquid samples and solutions, or dry materials. This lab bottle has a marking area to label for security and accountability, and a pour lip at the top of the neck opening helps prevent drips.