These 4" x 7" Sticky Thrip/Leafminer Traps unfold to expose adhesive on both sides to cover approximately 30 square inches per trap. Unique blue coloration of weatherproof cards attracts both thrips and leafminers. Nontoxic traps are simple to hang and won't get glue all over your hands when you take them down. Place traps every 7 feet apart or at end of each row. For badly infested plants, shake gently and flies will swarm a few moments before they fly to your nearby trap. Pack of five traps.