They weigh 2 lbs 8 oz each.  They're 9" in height and 7" wide and 7.5 Deep.  I would suggest putting rubber feet on the bottom so they won't slide with heavier books.

I found only one sale of the exact same bookends and they sold for $160 in 2022 on a website called Catawiki.  The lions look like brass but they're not; they're molded plastic.