Fly Trap Bag can lasts longer and more durable, it has a good effect of catching flies.Attracts flies from a 20 foot radius.Traps and holds 50,000 flies. The unique Attractant is 100% Biodegrading and no harmful chemicals or pesticides, the special formula attractant are non-toxic and environmentally safe. The attractant dissolves and activates when water is added into the bag. Lured by the scent,flies enter the trap through the yellow top cap and down into the water.The flies drown in closed plastic bags. It does not pollute the environment and does not produce odors.