Tick tock goes the coaster car on the clock work roller coaster building set from k39nex the hour hand inspired motorised coaster car lift sends the coaster car up the track and down a ride full of twists and turns this set comes with 303 parts primarily rods and connectors to build a k39nex thrill ride and if collect the infinite journey roller coaster building set and the revolution ferris wheel building set sold separately you can have a working amusement park right in your ho