The LEGO Marvel: Quantum Realm Explorers set (76109) is a 200-piece building toy released in 2018 as part of the LEGO Marvel theme. This set features an Explorer character and allows children ages 7-12 to explore the Quantum Realm through imaginative play. With a compact size of 1.8 inches in height and 7.5 inches in width, this set includes a variety of pieces to create exciting adventures for young LEGO enthusiasts.