We tested this product in our office! Last spring, someone (it doesn't matter who!) forgot to take out the compost, and in short order, we had fruit flies everywhere! These lids saved us! They screw onto regular size mason jars, which are easy to come by. Simply pour a quarter cup of apple cider vinegar into the jar, screw the cap on, and walk away! Fruit flies can fly in but not out!
Size: Includes 4 Reusable Fruit Fly Catching Lids (1x Blue, 1x Green, 1x Clear, x1 Yellow)
(1) Pour attractant into regular/small mouth Mason jar, such as apple cider vinegar
(2) Screw on Trap Cap
(3) Leave in a place frequented by fruit flies until they’re all trapped—clean and reuse all year long