Experience the amazing power and acceleration of this high-speed LEGO Technic 42072 WHACK! model, featuring a lime-green, red and gray color scheme with racing stickers, sturdy front bumper, large rear spoiler and wide black rims with low profile tires. This advanced building set is equipped with a pull-back motor and a new-for-December-2017 engine pop-out function, which is activated on impact. Combine with the 42073 BASH! pull-back model for extended play possibilities or to create the WHACK! ‘N’ BASH! combi model.