Catchmaster SilenTrap Refill Glue Boards allows you to continuously use your SilenTrap Flying Insect Trap for effective pesticide-free fly control. These glue board refill packs feature a long-lasting adhesive coating that traps the insects inside. It provides a safe and non-toxic way of controlling flying insects such as black flies, fruit flies, mosquitoes, gnats, and no-see-ums to stop them from creating nuisances in and out of your home. It is simple to use, just slide it out, dispose and replace with the new one. It is recommended to replace glue boards every month or when it is already full. Available with 2 glue boards per pack.