This series comprised 96 slide sets published in Germany between 1900 and 1928. Some sources cite Unger und Hoffmann as the makers, but others attribute them to Skladanowsky (using the trade name 'Projektion für Alle'), and some slides in the series correspond to stereoscopic slides definitely created by the latter business.

Found slides and boxes show that Unger und Hoffmann re-labeled under their own name or their trade name 'Verax'. Found newspaper photo shows Max Skladanowsky in his shop with the well-known boxes, under the name Projection für Alle (with a C).

All sets consist of 24 slides and have the format 8.3cm by 8.3cm. The slides are produced on very thin glass and were very cheap. A reading was issued with the purchase of the slide set, the slide set was issued in a paper box.

The slide sets produced before World War I have titles printed into the plate in German, English and French; slide sets issues after 1918 seem only to carry the German title on the glass plate.

Some slide sets exist in hand colored versions.