Four sliders; one with zebras, one with a lion, one with playing cards, and one with an optical illusion.
The optical illusion one is the only one that shows a manufacturer; Dodo Designs in England.
The other 3 just say, "Made In Germany" on the back, and Art No. xxxxxx. Don't know who made them.
The puzzle with the zebra is missing the little black-plastic stop-circle that fills in the extra hole in each of the other puzzles. It also has some small defects on the picture-surface of 3 of the pieces (hard to see in the photo).