Eazyzap replacement glue boards are an effective and discreet pest control solution. This set of genuine Eazyzap replacement boards fit the CT870 fly killer perfectly, helping to keep the unit working as effectively as possible. With extra-strong adhesive and pesticide, the boards ensure even the most stubborn insects are held in place and killed. It’s recommended to replace these boards every 4-6 weeks, depending on season and number of insects.