Is tawa made of cast iron?

Excuse me, I'm curious about the material used to make tawa. I've heard it's a versatile cooking tool, and I'm wondering if it's made of cast iron? I've seen some variations in my travels, so I'm not sure if the material varies or if there's a standard. Can you enlighten me on this matter? Is tawa, in its most traditional form, indeed crafted from cast iron?