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★The medical grade silicon glass pipette is environmental friendly and non-toxic. It is also reusable after clean up,and better than plastic pipette. ★Apply for testing laboratories, chemistry, microbiology, liquids, scents. Also widely used in home, such as feeding little animal and fish and so on. ★Wrapped with bubble paper,ideal package for glass products. ★Instructions:When adding the product, the dropper is just above the vertical. After drawing the liquid, the tip can not touch other objects, so as to avoid contamination of impurities. When used, do not only use the thumb and index finger pinching, with the middle finger and ring finger together. ★All our products are fullfilled by Amazon, relax to shopping. Any trouble please contact us to get a pleased answer.