This is a dual mount (can be mounted as a drop in, or as an under mount sink) granite sink. They do have variations that have double bowls. But this is neither porcelain or stainless steel.

[Kraus 33 inch Dual Mount 50/50 Double Bowl Black Onyx Granite Kitchen Sink[(https://www.houzz.com/products/dual-mount-50-50-double-bowl-granite-kitchen-sink-black-onyx-33-prvw-vr~37945534?lid=24125003)

[Kraus 33 inch Dual Mount 60/40 Double Bowl Black Onyx Granite Kitchen Sink[(https://www.houzz.com/products/33-1-2-dual-mount-60-40-double-bowl-black-onyx-granite-kitchen-sink-prvw-vr~37945541?lid=24125005)

If you need assistance in finding a porcelain or stainless steel drop in, please message us your sink base size, desired style and what type of double bowl you want for us to help you further.