Specifically formulated for use with Star bar Traps including the Fly Terminator, Milk Jug Trap and the Captivator Fly Trap the Star bar Fly Trap Attractant Refill is ideal for filth breeding flies. The easy to use refill is non-toxic, insecticide free and pouches conveniently dissolve and activate in water. Sold in an eight count, 30 gram size.