These are real fossilized teeth from an extinct species of Mackerel shark (otodus obliquus)!!
They are roughly 60 million years old and were found in Morocco. This species was once one of the planet's apex predators and specimens have been found in Africa, Asia, Europe and North America! Fully grown, these sharks would have reached roughly 9-12 meters in length.
These fossil teeth are ~1" long, and can be shipped worldwide! Each one is unique and price is per tooth.