I'm guessing it's the standard Weinmann X pads and holder.
The holders can have 4 or 3 sides, for the 4 side ones just bend one end down with a screwdriver and slide the pad out.
The 3 sided ones need to be installed the correct way round.
Can be a bit fiddely but not too hard.

Kool Stop make X pads in black and salmon - salmon work better in the wet but maybe wear down slightly faster.
https://www.koolstop.eu/rim-brake-pa...s-wxsa-salmon/

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