These are real Lesser Asiatic Yellow Bat skulls (Scotophilus kuhlii)! These megabats are indigenous to numerous areas including Pakistan, Malaysia, and the Philippines.
These skulls are roughly .75" long, and can be shipped worldwide!
They are sustainably hunted by the local peoples as a source of food and income. These bats have been studied and rated a level of "Least Concern" on the IUCN index of endangered/at-risk species due to their high reproductive rate and widespread distribution.