This is a Durable plastic that is made for Resin Casting.
Pieces pop out easily-May have a few water marks, but
a thin coat of resin or resin spray will take care of that.
This Mold is a custom designed
Retro Camper or Bath Bomb Mold
just a hair over 3.5 tall
by 3" wide at the bottom
and
1 3/8" Deep