At that time, the idea was that a large area on the surface was a solid button of a switch. haha, now I think about it, in fact, waterproof or something is not very good.
I don't know how to answer your question. At that time, when drawing, I only relied on the feeling and didn't think much about the material. I think it can be plastic, but the texture I added.. A long story
Take the order? Give me a contact information
Is this a touch button
Is the material black old leather