The LEGO Harry Potter Diagon Alley set (75978) is a highly detailed building toy featuring 5544 plastic pieces. This set is part of the LEGO Harry Potter theme, designed for ages 16 and up. It includes various iconic landmarks and characters from the Wizarding World, making it a must-have for fans of the franchise. With a release year of 2020, this set comes in a box packaging and measures 22.9 inches in length, 6.7 inches in height, and 18.9 inches in width.