Hello, aalaperr - That is pretty much a "standard gray" concrete block, and I believe it was supplied by Angeles Block here in southern California. You should not have much trouble getting CMU (concrete masonry units) in that color from a range of suppliers. We sealed it with a surface-applied product that deepened the color very slightly, but otherwise it's a very ordinary product (4 X 16", btw - not a standard size but we like the proportion).

Thanks for your question.

Best,

Paul

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