Trucks - Mount on your board and allow for turning/carving. Different sizes, usually between 8-10"
--and--
Hardware - Nuts and bolts used for mounting trucks.
Wheels - Invented by cavemen. Durometer=Hardness. Harder=Slides. ie. 78a soft, 86a hard
Bearings - Pushed into the wheels and put on trucks. Make wheels spin. Better bearings=Better ride
