Transparent plastic material, safe and environmentally friendly, it will not affect the viewing inside Snail Catcher. The diameter is about 8cm, the height is about 4cm, and the error is about 1cm Easy to release air to sink to the bottom. The aquarium trap has air hole design to release air and sink into the aquarium. Put the bait in the center, cover the top cover and place it vertically at the bottom of the fish tank. Can naturally catch snails and leeches in the fish tank, increasing the fun. Avoid using drugs to harm fish and aquatic plants, will not pollute the water quality.