Get ready for high-speed action and impacts with the WHACK! 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. • Features a powerful pull-back motor, sturdy front bumper, large rear spoiler, wide black rims with low profile tires and an engine pop-out function, which is activated on impact. • Check out the lime-green, red and gray color scheme with cool racing stickers. • Bring on the 42073 BASH! and let the race begin! • Activate the pull-back motor to launch the high-speed WHACK! • New-for-December-2017. See the engine fly out of the vehicle body on impact… WHACK! • This LEGO® Technic advanced building set is designed to provide an immersive and rewarding building experience. • Combine with the 42073 BASH! to create an awesome WHACK! ‘N’ BASH! combi model with 2 pop-out engines! • Suitable for ages 7-14. • WHACK! measures over 2” (6cm) high, 6” (17cm) long and 3” (9cm) wide. • Combi WHACK! ‘N' BASH! model measures over 3” (9cm) high, 7” (20cm) long and 3” (10cm) wide.