528 pcs Sunset Carnival is a high-level challenging puzzle for children aged 6 and up. It works on developing their patience and concentration as well as improve their resilience. Made of royal blue cardboard imported from Germany, high quality and no edge warping. The pieces are integrally molded, formaldehyde-free and no fluorescent agent. Packed in a magnetic closure box, for easy storage. It also comes with an invitation letter with a reference picture.