This is an omnidirectional wheel with built-in shock absorbers. The wheel rotates when the when an axle is secured to the wheel disc and can easily rotate forward and backward. The shock absorbers inside the wheel automatically absorb any force while keeping the vehicle stable putting less stress on the chassis and allowing for the wheel to still rotate freely on uneven terrain! The rollers on the Omni wheel allow for a vehicle to turn more easily and can also move sideways! If a vehicle has a holonomic drive train installed it can actually drift, do donuts, and crab walk! This wheel would also be helpful on the Moon or Mars because they will help astronauts ride comfortably, safely, and do cool tricks! I hope you enjoy our wheels and join us on our road trip to Mars and beyond!