E-Z Riders

[Robroy]

Would someone please explain the proper use, or how they are used.    thanks,  Roy Small   

[the Bach-man]

Dear Roy,
Simply place them on thhe  track and apply power.We make two versions; the ball bearing units go under drive wheels while the others go under the wheels that are unpowered, such as tender trucks.
Have fun!
the Bach-man

[Robroy]

Thanks Mr. B-man, I though so but was not for sure.

[glennk28]

How many in a package?  what is the height from railhead to top of rollers?  I have a bunch of Accucraft ball-bearing rollers and want to add the non-BB supports. 

[Robroy]

 4 in a pack.   1'' an 1/16 in. Or as near as I can see.