Guess What These Are

 

Ahh, you probably know, don't you? If you were around this planet as recently as say, the early '80s, then I'm sure you know.

Isn't it amazing how many different colors and designs were used in these?

Don't they bring back memories of riding around in a car on Saturdays, cruising the streets of downtown, checking out the girls and singing the most popular songs out loud with gusto?

Maybe you owned a collection of something and never really paid attention to these. They did come with what you collected, you know.

What are they?

The spindle-adapter centers (aka "spiders") of 45 rpm records.