I used golf balls at first. But the day after I put them in it looked loke the hens had played a round of golf with them they where scattered all over the coop. I got the hint. Went to Hobby Lobby and bought ceramic eggs there . The store had white or brown, I got Brown, and cost about 1.45 each. The fake eggs are on the same aisle as the fake fruit.They look so real my husband was fooled. I did have a woman with many years of experience with chickens tell me not to leve the fakes in once the hens got the idea where to lay, she said it encouraged broodiness. I did have one broody, and she was sitting on fakes, so I took them all away. Now everybody is laying where they are supposed to and no more broodies, knock on wood.