I have several , BUT just put 1 in the coop and 6 others are the red coke liter carriers . Guess which one THE 3 LAYERS ARE all USING ? yep , YOU GUESSED IT . so , i AM GOING TO ATTACH THE RED ONES ON THE WALL , AND bring in the rest of the black Milk grates and assemble accordingly . One day SOON we will have ALL 45 chickens laying , and they can PICK their favorite style and color . LOL.... If they don't like RED or BLACK , I will paint them PURPLE .