Steel ball bearings. :)
James Plimpton invented the roller skates with 4 wheels
The first transportation technology invented for roller skates was the wheeled skate, which featured a set of wheels mounted to the bottom of a shoe. This design, created in the 18th century, allowed users to glide smoothly over surfaces, mimicking the motion of ice skating. The addition of wheels revolutionized personal transportation and laid the groundwork for modern roller skating and other wheeled sports.
the man who invented roller skates was 100000000 years old
1795 in china
to entertain people
by being stupid in the head
Roller Skates
early 1700's
Actually, roller skates were invented in 1760 by Joseph Merlin, of Huy, Belgium.
um i think bill wasner did and in 1923
He invented the four wheel roller skates.
advancement in roller skates has changed dramatically. when roller skates were invented, they were something like this: a wooden plate resting on two sticks attached with wheels. as scince and technology changed, roller skates also strted to develope. around 1980's the new model of roller skates came out. this time it was much stable and quicker than the previous ones. those skates used ball bearings fitted in the wheels. the top was made of metal. these days they are more advanced. they still use ball bearings, metal top but added with a fluid, which allows to gain a quick and fast speed.