I think some kind of West Virginia Swirl.
(The question might have been between slag and swirl with those colors -- and I'm saying swirl.)
There were several companies who could have made it in the 30's through 50's. Others such as Ron ( @wvrons) might be able to narrow it down to one or two companies. I can't.
Welcome, Jen.
I so wish I had thought to rescue my dad's childhood marble bag before he decided that it was too worn to keep any longer. I knew about his bag before I started collecting marbles, but after I started collecting I let a few years lapse before it occurred to me to ask him about it, and when I asked it was too late.
Your green one has a good chance of being Master. Some small part of me wondered if it might be a modern marble which resembles Masters. But I think probably Master.
(Well, I mean your marble is a Peltier Rainbo ... which ever one it is that you think it might resemble. )
My avatar marble is a Dave's Appalachian Swirl.
Good chance of Jabo on the last one.
Need different views of the first one. If the ribbons stretch in a way that their ends might form a top and a bottom of the marble, then need those views.
The top might have been someone's favorite shooter! I can't tell what it is behind the damage.
The middle is a Vitro Tiger Eye from the 1950's.
The bottom is a West Virginia swirl. Many WV companies were making these in the 30's through 50's.
Mostly cat's eyes. A few Masters maybe? I don't see any handmades.
The most interesting ones to me are the clear with the white ribbons on the edges which probably are Vitro cat's eyes, but it's an interesting construction. If there are 8 ribbons there, then that might be special.
Soooo .... yes, some people would probably call it slingshot ammo. Except the possible 8-ribbons cats.
$15?