When I was back in high school, I was in art classes. We would use this object, I believe it was called a shader or something like this. It helped us to do shading. If we had darken something, we could use this object to do shadowing or make it lighter. I wanted to find buy one, but I can't recall the exact name of it. It looked like a pencil w/ double ends, but no ink or lead was inside. It was made out of the beige recycle eco friendly material. Help. Thanks.
