This fossilized bivalve center this is a nice example and in very good shape and has very distinct features.
This is the fossilized remains of a Bivalve commonly referred to as a "Fossil Clam Core"

This products and others you see being offered by Dark Water Megs are fossils, they are not modern bone, they are not modern animal products.
Dark Water Megs does not and has never sold animal products, these are fossils.
"Fossil: impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock"