in-line skate 
Reinforced boot with four wheels placed in a straight line; it is used to move around on a hard, relatively smooth surface.
Device that connects the wheels to the boot.
Wheel’s rotational axis that connects it to the frame.
Round object that turns on an axis so the skate can move backward or forward.
Rubber pad at the back of the skate that enables the skater to slow down or stop.
Ankle boot that protects the foot and ankle; depending on the intended use, it can be soft, semisoft or hard (shell).
Clip made up of a metal ring that fits into an adjusting catch to tighten the boot.
Part of the boot that covers the lower part of the leg; it is usually hinged at the ankle.
Cushioned, often removable lining that is designed for greater comfort inside the boot.