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Premium Material: Aquarium Dropper is made of premium non-toxic plastic and rubber material, will not harm your fish, you can use it rest assure. Product Feature: Aquarium water changer has 4 scales on the pipe (10ml/ 15ml/ 20ml/ 30ml), easy to read standard measuring marks. Easy to Use: The amount of water absorbed by dropper can be adjusted by controlling the strength of grasping the dropper end. Keep Fish Tank Clean: The Aquarium Gravel Cleaning Straw can remove the dirt and residual feed at the bottom of fish tank. Help to keep your fish tank clean. Widely Use: The pipette scale dropper can be used to clean fish manure and feed, also can be regarded as a small fish tank and aquarium water changer.