This item is a special tool for catching snails. It is made of clear plasic and it is easy to assemble. There are holes on the lid for the fishing line to go through. And then you can connect the lid and the base. Just put it into the fish tank and wait, it will not let you down. Feature - Color: Clear- Material: Plastic- Size: 6x6x4cm/2.4x2.4x1.6inch- With little holes, it is easy to release air and sink to the bottom- It is used to catch the snails which may influence the apperance of fish tank.- Open the lid and push the fishing line into the stomata base.- Made of clear plastic, it is easy to clean and will not pollute the water.- Catch snail and will not do harm to fish and plants.Packing list: 1 x Snail Catcher