What type of pedals are these?
They are road pedals made by XLC parts.
https://www.xlc-parts.com/en/road/bike-parts/pedals/

At XLC you can choose between clip-in pedals based on the SPS or Look system.

You should be able work out which system that pedal is using from the part number and get the appropriate set of cleats.
Probably either Look Delta or Look Keo.