First 2 turquoise ones are Imperial
Second looks Akro
Third MK
Fourth Chinese torch marble
I should know this one but my mind isn't up to speed yet today
Heard of a lot of marbles made for all kinds different industrial use, paint spray can rattlers etc...... Can't say I ever heard of Tracor specifically ??
The two on the left are Geoffrey Beetem, the one on the right is an unknown auger type. The two by Beetem are around 1 1/2" the auger is slightly smaller.
Looks like oven brick w/ trapped air bubble all around it giving the impression of metal or mica. Similar to the trapped air you see on & around the figure inside a Sulphide IMO