Product Usage: 1. Clean up the fish tank garbage 2. Change the water in the fish tank 3. Metering liquids Product color:white, blue, black, green Product Material:Thickened silicone + high transparent ABS Product Size: 1.28cm; 30ml; 3.45cm; 50ml; Package Includes:fish tank straw*1PCS Product Features: 1. Two scale designs, milligrams and ounces, to meet different needs 2. High-quality rubber suction bag, thickened and enlarged, strong and durable. 3. Highly transparent ABS tube body, resistant to compression and not deformed. 4. Detachable design for easy cleaning and storage. 5. 4mm large diameter water inlet, which can absorb most impurities and feces. Product Instructions: 1. Pinch the suction bag (outside the water) 2. Put it in the fish tank and aim at the target 3. Release the suction bag to absorb water or fish tank garbage 4. Take out the straw, the mouth of the straw is inclined upward 5. Pinch the airbag to release the water Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.