Pheromone lures are sealed in foil or special polymer packs and stored at cold temperatures for maximum shelf life. They should be stored away from volatile chemicals or pesticides, and never exposed to high temperatures (e.g. in a vehicle on a hot day).
Only open the sealed packs when you are ready to use the lures, and place them carefully into the trap with the minimum of handling. If hands are likely to be contaminated with other materials, wear surgical gloves. Lures generally last 4-6 weeks before they need to be replaced.