What’s in the Box? Big D Cockroach Syringe Gel Bait is designed for killing cockroaches. A small syringe pack draws the least attention. Just inject into cracks and crevices or apply near cockroach harbourages where they feed. The gel will dry firm within a minute, preventing it from being easily tracked throughout your house. A powerful attractant attracts cockroaches to it, killing them quickly and efficiently without alarming their predators. This odourless gel is easy to apply using our unique plunger that creates a fine mist. As a gel, it sticks well to vertical surfaces, providing a barrier against your insect pests.