Removing the paper covering unveils the subsequent view:
In next image you can clearly view the internal structure of a bread board. The heart of a bread board is these metal clips. These metal clips are generally made of nickel silver as it is conductive, corrosion resistant and little stretchable too.
We can see there are two types of clips in the bread board, one for bus strip and other for socket strip. Let’s remove them from the plastic blocks to have a closure look.
There are a total of 128 metal clips in socket strip region each with 5 holes and 8 clips in bus strip region each with 25 holes.