The LEGO Super Mario: Peach's Castle Expansion Set (71408) is a plastic building set with 1216 pieces, designed for ages 9-11. It features Princess Peach's Castle from the Super Mario gaming franchise and measures 18.898 inches in length, 14.882 inches in width, and 3.701 inches in height. The set comes in a box and was released in 2022 as part of the LEGO Super Mario theme.