10x Squalicorax pristodontus (Crow Shark),
All from the Phosphate mines of Cretaceous/Eocene age from Khourigba Morocco. 22mm on average
Can be tipped out into boxes with sand in, this fun way of teaching children about finding fossils, is also educational. And the bonus is they are so cheap, they can keep what they find. You get 10 teeth of excellent grade.