These are PP film rolls coated with non drying adhesive on both the sides which trap insects/pests when in flight. When you have an insect population in a large area that you need to monitor and trap, this sticky roll is the answer for you. Yellow Sticky Role utilizes certain insects’ attraction to the color yellow to trap them on its sticky surface. Yellow sticky traps are used to attract, trap and monitor aphids, flies, leaf minors, fungus gnats and many others types of insects.