It's scary they are so heavy!
At least the stylus is diamond....Those steel needles used on the conventional lateral reproducers of the day still scare me.
I have seen people try and sell Edison Diamond discs that someone, somewhere, tried to play with a steel needle
.
They are torn up the minute that steel needle hits the "Condensite" (Bakelite) and the needle digs through the Bakelite, into the wood flour core.
I have both wood flour core, and clay core recordings. With care they are very durable, especially compared to shellac 78"s that
are as brittle as eggshells.