This is a lot of fossilized turtle shell pieces. These were found in the Bone Valley Formation in south Florida. This region has rich deposits of fossils from the Miocene epoch to the Pleistocene epoch. The exact species of these pieces is not known, but someone with more expertise might be able to identify them. There are five (5) pieces that weigh a total of approx. 148 grams.
Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing all of the pieces shown.