Cement is only an ingredient of concrete. So these are not made of "pure cement" because that would just be a pile of powder, which wouldn't resonate all that well. This is a cool project, I'm curious about sound quality though. Sound absorbing insulation inside?
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Cement is only an ingredient of concrete. So these are not made of "pure cement" because that would just be a pile of powder, which wouldn't resonate all that well. This is a cool project, I'm curious about sound quality though. Sound absorbing insulation inside?