How to pronounce “vellum” in English

So while the mailroom of Iskari First Imperial in Agdel Lex noticed that the vellum envelope that appeared in their priority delivery box one workday morning,

My insurance policy, along with a vellum scroll held to my thin, pale, old man's calf with a rubber band."

And then they kind of walk out with a 1,000-year-old vellum manuscript which is magnificently illuminated and if you happen to read Greek or Latin,