These are weathered nilgai skulls with horns. They do not have the mandibles.
The #1 grade skulls are the nicest and generally have a nice skull and horns.
The #2 grade skulls have broken skulls.
The #3 grade skulls are the lowest quality skulls.
Nilgai are not an endangered species and are not subject to CITES controls.
A USFWS export permit is required for all shipments outside the USA.