Brooding eggs are ideal to show new additions to your coop where you want them to lay, some claim that by leaving eggs in your nesting boxes will even encourage your chooks to lay.
Another handy use is for brooding hens, great to place under hens whilst they wait for you to set her on the real thing (if at all).
These amazingly realistic poultry eggs are suitable for both bantams, medium and heavy breeds and even ducks.