Graduated Dropper Pipettes include pipettes and the rubber squeeze bulb used together. Its main use is to transfer liquids, such as essential oils, acid, solvent, etc. It is widely used in labs, teaching experiments, microbiology, etc. Its material is borosilicate glass with clear scale lines, which is very practical.SpecificationPipette Capacity: 15mlPipette Length: 32cm/12.6inchPipette Diameter: 12mm/0.47inchMinimum Division Scale: 0.1mlRubber Bulb Capacity: 30mlMaterial: Borosilicate Glass, RubberColor: ClearPackage List: 1 x Dropper Pipette, 1 x Rubber Squeeze BulbAdvantageIt is made of borosilicate glass, which is thick and durable, so it can be used repeatedly. Moreover, the borosilicate glass material has high temperature and corrosion resistance.