Well quite big (10cm across) and actually quite good.
I mentioned these a few posts ago, as they had been cluttering up my modelling table since I rediscovered
them in a box some weeks ago.
A few years ago I was given a terrain board about 1 metre square which had at one end a large hill, and these 1/300 scale bunkers had been built in to it. Sadly the board fell victim to my house move a few years back - from a small house with large garage (the board lived in the roof space of the latter) to a bigger house with a smaller garage. As I couldn't find anyone to take it off my hands I binned it, but only after I had salvaged the bunkers.
They then languished in the aforementioned box until I decided that a refurb was in order. This was confined to cleaning glue and plaster off the resin castings from where they had been stuck into the board, and then painting the exposed areas in the brownish stone colour seen in the photos. I saved as much of the original paintwork as I could. They look OK to me - now I just need to write them into a game...