White Rings

I went to Michaels and Hobby Lobby and got four sizes of cabone rings.

They are used by ladies who sew stuff.

I am not really sure why.

They are plastic ring with a circular cross section.  The plastic is soft and does not glue well.
 

 

In real life vehicle tires were made out of natural rubber and were white until about 1915 when they started adding chemicals to the rubber to make it last longer, and turning tires black.  So I made an old time car using these white rubber tires.