Open-close Structure: Moveable wall designed allow you to unfold the cathedral and panoramic views its internal details. Take you to discover the art of the St Paul's Cathedral. Amazing Assembly Experience: Comes with 643 Pieces to assembly, which is challenging for adult and children and also a decent gift for the puzzle enthusiasts and also a autistic toys for boys and girls. It is great helper to developing hand-eye coordination, concentration, attention span and an understanding of spatial relationships. Upgraded Design: Designed with inside and outside double color manuscript, reproduction of the millennium church with fine details, which bring you a beauty of the ancient art. Finished 18.59Length 11.18Weight 11.74Hight. Recommend for aged 14+. Take 16hs+ to assemble. No tool and glue need. Hope our products will bring you more happiness. If there is any issue, just let us know then we will make a satisfying solution special for you.