As with all Bone Clones® products, only the finest casting materials are used to cast our North American Bird Egg Series. Our expert artists paint each with meticulous care to match the eggs that were used in the casting process. Each egg is hand painted with permanent dyes and sealed with a resistant coating that makes it ideal for handling, study, teaching, as well as for display. In nature, eggs vary from region to region as well as from bird to bird. The colors and patterns used were determined by the egg used as well as reference material to find a happy medium that would be representative of the species.