Porcelain over metal (could be cast iron). The brick apartment building was built in the late 60's. We moved in here in 2002. One bathroom has a yellow tub, toilet, sink and tile, the other bathroom is pink tub, toilet, sink and tile. Both have sliding shower doors decorated with wading birds. I love my colors. The oven door is broken and the broiler doesn't work so an upgrade is in the works. Gee, I wonder if the new one will last 40yrs like the original one did?Are they porcelain or metal?