I have googled and schmoogled from this way to China and I can't , for the life of me locate (or even find the exact name) those clear cellophane type wraps for individual slices of cake.
I see them in some upscale bakeries that sell slices of cake. The cake has been pre-cut and each slice has some sort of food grade clear plastic wrap on both cut sides, protecting it from drying out (Lord only knows what chemicals are in those sliced cakes at Starbucks that are never wrapped and seem to always stay mysteriously chemically moist).
Some of the "cake slice wrappers" I have seen are simply clear and others have been printed with company logos, or designs. Clear is just fine for us - we are simply trying to keep a pre cut slice of cake from being dry, yet not taking away from its appearance in the display case.
Does anyone know what those wrappers are called and/or where to order them?