CLEAR READING LINE - The dropper's scale is very precise, clear and professional, and the calibration marks are easy to read. They are marked with 0.25ml, 0.50ml, 0.75ml and 1ml respectively. HIGH QUALITY - The pipette is made of high quality glass and rubber, thick and durable, the rubber head is very thick and sturdy, with good absorbency to keep the liquid in the pipette. Easy to clean - the black top of the glass parison is removable. The rubber cap can be easily removed and water can flow through the entire pipette dropper. These droppers are quick and easy to clean and sanitize, and are reusable, superior to plastic pipettes. High cost performance - 20pcs in total, 2 glass graduated pipettes in different shapes with silicone caps, perfect for your different needs. When you mix multiple substances, each substance has its own pipette. Convenient. WIDE USE - These calibrated glass pipettes accurately transfer and measure liquids such as reagents, water, essential oils, spices and more, suitable for testing laboratories, laboratory chemistry, food research, perfumes and more. Features: 2. After the liquid is sucked, the suction head must not touch other objects to avoid contamination. 3. The rubber head must not come into contact with corrosive liquids. 4. Glass products, please keep away from children. Scope of supply: 10 1 ml glass droppers (straight) 10 pipettes - 1 ml glass drop (curved)