This is a set of ten shop manuals for various Mercedes models, including the famous "Gull-Wing" 300 SL. Microfilm cassettes are much rarer than the single reel microfilm cartridges. There are a few brief mentions of the format on the web, but no pictures that I could find.

Cassettes include:
1.   W/S Manual August 1959
2.   W/S Manual 190 & 180–220 SE<3>3.   W/S Manual OM 636 /621–170–300
4.   W/S Manual 300 SL
5.   Technical Data Books 1957, 1960, 1963
6.   W/S Manual 108–113
7.   W/S Manual 114/115 & 108–115 Repair
8.   W/S Manual 600
9.   Missing
10. W/S Manual Starting Series 107

A "W/S" manual is a workshop manual, as opposed to an owner's manual.