fish23geeks
glad they work for you, but ball bearings would definitely make tracks in my wood floor made out of 3/4" thick oak. More of them, to avoid making tracks, would move more readily than my 3 dual wheel hard plastic casters (photo/link above).
It is a challenge to get the minimum ’number of wheels and amount of wheel surface’, i.e. diameter of the wheel. to maintain stability yet permit movement when a good amount of force is applied. Avoiding marks in/on the floor is part of the game. The contact surface of a ball bearing is very small.
After changing so much in my system, I decided, "I should up my casters game". Research (not enough), high quality sources, high prices, make sure you can return them, I returned about 5 sets, went back to my furniture grade hard plastic dual wheel. Ball bearings do not rock, a big advantage, IF they will not make marks in the floor.
The primary thing I learned about all the wheel attempts is lack of movement in the axels is critical.