This book is part of the Kumi series which consist of: Shape, Color, Hijaiah, Number, and Alphabet. These are the five main topics that are essentials for children. Kumi books were designed with cute illustrations and enticing colors to attract children's attention and make them interested in reading and learning what's inside the book. They were made from high quality good materials and are safe for children. Kumi books are suitable for children under 5 years old.