sed for holding and transferring liquids. They are made of Pyrex, Kimax, or TEKK, which h means that they can be heated directly with a Bunsen burner and not break. Even though these have milliliter marking on the side for measurement, they are NOT accurate measuring devices; they give approximations only. All of these over one liter (1000 mL) in volume will have a handle attached to them to hold them