The Mega Bloks Halo Series 3 Mystery Pack - UNSC Cyan CQB is a collectible building toy set featuring interlocking blocks themed around the Halo universe. This set, released in 2011, includes plastic pieces to build various structures and vehicles, perfect for fans of the space and military themes. With the pack sealed in a polybag, it offers a fun and creative building experience for ages 8 and up, as well as collectors of the retired Halo product line. Compatible with Mega Bloks products, this set allows for endless possibilities to create and play within the Halo universe.