The LEGO NINJAGO Kai's Mech Rider EVO 71783 is a complete building toy set with 312 plastic pieces. It features Kai, Bone King, and Nya characters and is designed for ages 7+. The set includes a box for packaging and measures 10" in length, 8" in width, and 3" in height. The LEGO set is part of the Building subtheme and is not retired. It is set to be released in 2023.