Color coded for easy understanding! Each part is color-coded so it is very easy to understand and useful for lectures, classes, and self-submission. It can also be used in a variety of situations, such as orthopedic procedures and orthopedic explanations, and for teaching and learning of clanial techniques (skull correction). YELLOW HUGE PURPLE: NOSE BONE LIGHT BLUE FORESCULAL BEIGE SCULAL BEIGE: ACRYLIC BONE GREEN: PTICAL BONE BLUE : CHEK BONE ORANGE: SKULL BEIGE: POLISKULL VERASON : Butterfly.