Will not pollute the water quality, environmental protection and durability. According to the snail's habits to induce snails to the catcher, will not do harm to fish and plants. Reduce the impact of fish on the fish tank to maintain the ecological balance of the fish tank. Open the lid and push the fishing line into the stomata , with little holes, it is easy to release and sink to the bottom. Plastic snail trap catcher, according to the snail living habit design. Easy to install, easy to operate. : 1. Open the cover on the top of the . 2. Put the fishing line through the top of the two holes for later . 3. Pour bait into the middle of the bait zone. 4. Cover the lid vertically into the cylinder. colour:Transparent Material:plastic size:6cm Package Contents: 2 x Snail catcher Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.