The 2002 Mega Bloks Alien Agency The Arrival Hangar 18 Set #5621 is a high-quality building toy designed for advanced builders aged 18 and up. Produced by Mega Bloks, this set allows enthusiasts to construct a detailed alien-themed airport complete with a hangar and various structures. With its intricate design and attention to detail, this product is perfect for collectors and fans of building toys who enjoy creating unique and imaginative creations.