Qualified MaterialManual fish tank water changer aquarium dropper is made of high quality non-toxic plastic material, durable and practical. It will not harm your fish. You can use it with confidence.Easy to UseThe amount of water absorbed by the dropper can be adjusted by controlling the strength of gripping the end of the dropper. Please clean items before use.Scale Design There are 4 scales on the tube (10ml/ 15ml/ 20ml/ 30ml), and the tube has a clear scale printed on it. This aquarium water transfer tool is printed with clear and precise scales for easy measurement of liquids.Keep the fish tank cleanThe aquarium gravel cleaning straw can remove the dirt and residual feed from the bottom of the fish tank. Great for stirring up waste and sucking it up without putting too much pressure on the fish. Helps keep the tank clean.Wide UseThis aquarium cleaning straw dropper is also suitable for brine shrimp and bloodworm feeding after food thawing as well as live feed or small pellet liquid feed.Small blue 28cm