People ride in cages that spin freely while traveling along a rotating arm, which also spins.
This ride has a high nausea rating of about 7. As such, it is recommended to place a Handyman patrolling around the area or build a First Aid Room next to it as guests may vomit on the ground.
In Real Life
Zipper in RCT3 is nearly an exact replica of the real life Zipper manufactured by Chance Rides. Zipper is a common ride at US fair/showgrounds with a handful traveling around other countries.