Weighted white plastic brood eggs. Dimensions: Small 40mm L x 30mm D - weighing 11gm each. Large: 63mm L x 44mm D - weighing 36gm each. Facilitates training hens to lay their eggs in the provided nesting boxes. This creates a safe place for the eggs where they are unlikely to break. Broken eggs encourage the hens to eat their eggs: this is a difficult habit to break.