[Boatanchors] Question re Capacitors

[bc at councilman.com]

Hoping the group will educate me re some capacitors recently found in a junk box.  Your help is always much appreciated.

1) what would they come out of?
2) electrolytics inside?
3) should I toss them?

Rectangular (4.5 x 2.5 x 2.5") metal case 

6 mfd @ 800 vdc
2 mfd @ 1000 vdc

Industrial Radio Corp
Chicago Ill
Motorola # 8B81109
Type SPR 9801

--Brad  W1BCC