Material Quality---This aquarium dropper is made of high quality plastic material, which is non-toxic, eco-friendly and durable,Not easy to corrode, wear-resistant, not easy to be bitten by fish, will not harm your fish. Multi Features---This aquarium dropper not only can remove the dirt and feed at the fish tank bottom, but also can be used as a water changer for mini fish tank and aquarium. More convenient for your life. Product Design---This aquarium dropper adopts two-stage design, in addition to the dropper, we provide an extension pipe, you can decide whether to add it or not based on the depth of the water. Easy to Use---The amount of water absorbed by dropper can be adjusted by controlling the strength of grasping the dropper end. Please clean the product before use.This aquarium dropper with 4 scales on the pipe (10ml/15ml/20ml/30ml), that is easy for you to read standard measurement markings conveniently. After-sales Service---If you encounter quality problems in the process of using the product, please contact us in time, we will solve it for you